1.

yer kicks a ball of mass 250 g placed at the centre of a field. The ball leaves his foot with aspeed of 8 m/s. Find the work done by the player on the ball

Answer»

Work done = change in Kinetic Energy

initital Kinetic Energy = 0

final Kinetic Energy =1/2×m×v^2

Here m=0.25 kg ; v=8 m/s

so Kinetic Energy =1/2×0.25×8^2

=8 J

so work done = 8-0=8 joule



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