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+1 vote
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in Physics by (30.0k points)

The velocity of a body moving in a straight line is increased by applying a constant force F, for some distance in the direction of the motion. Prove that the increase in the kinetic energy of the body is equal to the work done by the force on the body.

1 Answer

+1 vote
by (130k points)
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Best answer

v2 – u2 = 2 a.s

this give s = v2 - u2 / 2 a

F = m a

we can write work done (W) by this force F as

W = m a ( v2 - u2 / 2a ) = 1/2mv2 - 1/2mu2 = (K.E)f - (K.E)i

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