Please answer these questions within today as I've my exams tomorrow .So I couldn'task them individually .Thanks a lot.
14. An Object starts With an initial velocity 'ti' and Lm udergoes uniform accelerati0n acquires a Velocity 'v' in time Draw its velocity- time graph. From this graph oblat velocity-time equation. 15. a) When action and reaction forces are equal and opposite,why don't they each other? 'b) Which would require a greater force to accelerate:-a 1/2 kg mass at 5 or mass at 2n/s* ? State universal law of gravitation. b) The gravitational force between 2 small spheres is T'. What will happen if mass* of both the spheres are doubled? State 2 differences between mass and weight. What will be the weight of an Object on moon whose mass is 10 kg on earth.(Take g on earth—10 m/s2 ) 17. 19. 20. 21. 22. State Newton's 11 law of motion. A truck starts from rest and rolls down a hill with a constant acceleration. It travels b) (a) (a) (b) (a) (b) a distance of 400 m in 20s.Find the acceleration of the truck. (3) Describe the two ways in which the physical states of matter can be changed, Draw the " states of matter triangle" to show the inter conversion ofstates of matte" Differentiate between mixture and compound. Classify the following as mixture or compound; (i) Air (ii) Copper sulphate (iii) Iron Sulphur (iv) Tincture of iodine (v) Barium chloride (vi) Milk Differentiate between striated, unstriated and cardiac muscles on the basis of their shape, number of nuclei, and their location? Complete the following flow chart 810 part fluid mat'ix An athelete is cycling along 1 /4 th of the circumference Of the circle.He moves along ths

Dear Student,

Ans- 14-
                Let us consider an object moving with initial velocity 'u' and uniform acceleration 'a'. Let object reaches at point B after time 't', and its final velocity becomes 'v'.
From figure given below,
          Let OE = time , t
So  , BE= AB + AE

v = DC + OD ( since , AB = DC and AB = OD)v = DC +u ( since, OD = u)so v = DC +u .............(1) Now acceleration , a = Change in velocitytime                           a = v-ut= OC-ODt= DCt                            at = DC           ............(2)Substituting the value of DC from (2)to (1),                                   v = at +u                              v = u +at          [the required equation]

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