Q10 of 21 Page 109

A force acts for 10s on a stationary body of mass 100kg after which the force ceases to act. The body moves through a distance of 100 m in the next 5s. Calculate

(a) The velocity acquired by the body


(b) The acceleration produced by the force


(c) The magnitude of the force.

(a) Let v be the velocity acquired by the body


After acquiring the velocity, v body moves a distance = d



In time = t



Acquired speed = v =



(b) Now consider the initial state


Body is at rest so, initial velocity = u = 0


Final velocity = velocity acquired = v = 20 ms–1


Time for which force acts = t = 10 s





(c) The magnitude of force = F






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