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Syllabus
4. At a certain instant, an auto driver is driving at a speed of 30 km h-1. Then, he uniformly accelerates the auto
In a rough horizontal surface
9. A truck of mass 2500kg is moving at the speed of 54 km/h and its acted upon by two forces of SOON due to the engine and a retarding force of 100N due to friction. Calculate the acceleration of the truck and distance moves by it in 10 minutes?
Ch.gravitation
(a) the height from which the ball was released,
(b) the velocity with which the ball will strike the ground.
Actually I am not understanding the solution done by the previous expert.....!
.vivek... Alankar.. Abhi.......
Q.20. A ball is thrown vertically upwards from the top of a tower with an initial velocity of 19.6 m . The ball reaches the ground after 5 s. Calculate :
(i) the height of the tower,
(ii) the velocity of ball on reaching the ground.
Take g = 9.8 m .
Q.15. A body of mass 500 g, initially at rest, is acted upon by a force which causes it to move a distance of 4 m in 2 s, Calculate the force applied.
Ans. 1 N
8. On a cold, rainy day, you find yourself in a car with a dead battery. You must push the car to move it and get it started. Why can't you move the car by remaining comfartably inside and pushing against the dashboard?
question 14 & 15.
4. A body of mass 0.5 kg is placed on ground. The coefficient of friction between the mass and the ground is μs = μk = 0.2. A horizontal force F = (2 sin t) is applied on the mass as shown in the figure. Find the velocity of the body when its acceleration becomes zero for the first time after start. (Take g = 10 m/s2)
(A) 0
(B) 3.6 m/s
(C) 2.73 m/s
(D) none of these