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A player kicks a ball of mass 250g at the centre of a field. The ball haves his foot with a speed of 10m//s Find the work done by the player on the ball. |
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Answer» The ball, which is initially at rest, gains kinetic energy due to work done on it by the player. Thus, the work done by the player on the ball, W = kinetic energy `(E_k)` of the ball as it leaves as it leaves his foot, i.e., `W= E_k l= (1)/(2)mupsilon^2` Here, `m = 250g =0.25kg, upsilon = 10//s` Thus, `W =(1)/(2) (0.25kg)(10m//s)^2 = 12.5J` |
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