# 1. A body moves in a circle of radius ‘2R’. What is the distance covered and the displacement of the body after 2 complete rounds?2. What can you say about the motion of an object whose distance-time graph is a straight line parallel to the time axis?3. Define speed of a body?1. A boy after going around a circular track of radius ‘r’ comes back to the starting point. What is the(i) Displacement of the body?(1. Write the other name for non-uniform motion.2. Draw a velocity-time graph for a body moving with a uniform acceleration. Assume that the body is initially at rest.3. Give an example of a motion in which distance is covered but there is no displacement.4. What is retardation? Give its SI unit.5. Can a body have acceleration while at rest? Give an example.6. A car travels 1 km and returns back to the same point in a different path. What is the average velocity?7. Relate 36 km/h with m/sec.8. A cyclist is riding a circular path of radius 5 m with a speed of 10m/s. What is the change in velocity when he has travelled through a semicircle?9. If 5m/s and 10m/s are the velocities of a body having a uniform acceleration in some time interval, what will be its average velocity?10. Is uniform circular motion, an example of constant acceleration?ii) Total distance covered by him? 19. Write is the other name for non-uniform motion.20. Draw the velocity-time graph for a body moving with a uniform acceleration. Assume that the body is initially at rest. 21. What does a speedometer measure?22. Name a physical quantity that (i) varies (ii) remains same, in a uniform circular motion.23. When a body moving with a speed of 20m/sec stops in 20 seconds, what is the acceleration?24. What is the value of acceleration, if v-t graph is a straight line parallel to the time axis? 26. Give one type of motion where distance and displacement are same.27. A moving body with a constant speed, say 10ms-1 on a frictionless surface has uniform motion while a freely falling object has non-uniform motion. Give reason.28. A 150m long train crosses a bridge of length 250m in 25 seconds. What is its velocity?29. A ship is moving at a speed of 56km/h. One second later it is moving at 58km/h. What is its acceleration?30. The speed of a car is 54km/h. Express this speed in m/s and calculate the distance covered by the car in 5 seconds.31. A car travelling at 20km/h speeds up to 60km/h in 6 seconds. What is its acceleration?32. Name the physical quantity needed for the acceleration to be non-uniform.33. Express km/h2 in ms-2.34. If a car starts from rest and attains 20 ms-1 on 25 seconds. Find the acceleration.35. How long will it take for a body accelerating by 2 ms-2 to gain a velocity of 10 ms-1, starting from rest?36. When the slope of v-t graph is –ve and constant, what is the nature of acceleration?37. A car accelerates uniformly from 18km/h to 36km/h in 5s, calculate acceleration in:(i) km/h2(ii) m/s238. What do you mean by uniform acceleration?39. A train travels from station A to station B with a speed of 36km/h and returns to A with a speed of 54km/h. What is the average velocity and the average speed of travel?40. Draw the shape of v-t graphs in the following cases:(i) Uniform retardation(ii) Non-uniform retardation41. A body is moving with a velocity of 10 m/s. If the motion is uniform, what will be its velocity after 10 seconds?42. A graph drawn between speed and time for a moving body is found to be a straight line parallel to the time axis. What conclusion can you draw from the graph about the speed of the body?43. A man keeps 12 steps in Northern direction and turns left to keep 5 steps. He then returns to the initial point by the shortest path. Find: (i) Distance travelled(ii) Displacement [Given: each step is 0.3m.]44. Identify the scalars and vectors among the following: Mass, acceleration, velocity, pressure, force.45. Is displacement independent of path? How?46. A man travels 10m to the east, 20m to the north and then 20√2m south-west. Find:(i) Displacement and(ii) Distance travelled47. A car travels with a velocity of V1 m/s for S m and with V2 m/s for another S m. What is the average velocity in the straight line motion?48. A train is moving with a velocity of 36km/h. Calculate the distance travelled by the train in:(i) 1 hour(ii) 1 minute 49. A child completes a circular track of 200m length in 10 seconds. Find the speed and velocity.50. A cyclist has a speed of 5m/s North wards. He changes the direction to west and continues with the same speed of 5m/s. Is there any acceleration? (Time taken is 5 second)51. A car moves with a speed of 30km/h for half an hour, 25km/h for one hour and 40km/h for two hours, calculate the average speed of the car.52. What is meant by uniform and non-uniform motion? What is the nature of distance-time graphs for uniform and non-uniform motion of an object?54. A car travelling at 20km/h, it speeds up to 60km/h in 6 seconds. What is its acceleration?55. A circular track has a circumference of 3140m with AB as one of its diameter. A scooterist moves from A to B along the circular path with a uniform speed of 10 m/s. Find:(a) Distance covered by the scooterist(b) Displacement by the scooterist(c) Time taken by the scooterist in reaching from A to B56. A car travels 30 km with a speed of 40km/h and the next 30km with a uniform speed of 20km/h, find the average speed.57. On a 120m track, a train travels the first 30km at a uniform speed of 30km/h for the next 0.24h and then at 70km/h for the next 0.71h. What is the average speed of the train?59. A scooterist travels at a speed of 5m/s for 2 minutes, at 12.5m/s for 10 minutes and then with 10m/s for 5 minutes. What is the average velocity and distance covered in this time?60. A car moves in a circular path of radius 14 m at a speed of 10 m/s. Evaluate: (i) Time taken to complete the circle(ii) Does the motion have uniform acceleration? Give reasons.(iii) Find the angular velocity.61. State which of the following situations are possible and give an example of each of these:(a) A body moving with a constant acceleration but with zero velocity.(b) A body moving with acceleration in a vertical direction.(c) A body moving with a constant velocity in an accelerated motion.62. Joseph jogs from one end A to the other end B of a straight 300m road in 2 minutes 50 seconds and then turns around and jogs 100m back to point C in another 1 minute. What are Joseph’s average speeds and velocities in jogging(a) From A to B(b) From A to C

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