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A player kicks a ball of mass 250g at t...

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.

Text Solution

Verified by Experts

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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