# A child of mass 35 kg sits on atrolley of mass 5 kg. The trolley is given a push by a speed of 4 m/s. The trolley comes to rest after 16 m. calculate work done by the trolley

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by jacksan1828

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by jacksan1828

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Energy Of any body is always conserve, it can be transfer one form to another form.

K.E(final) = 1/2m(v₂)²

v₁ = 4 m/s , v₂ = 0 (in the rest)

K.E(initial)= K.E(final) +Work-done(W)

Work-done(W) = K.E(initial) - K.E(final)

W = 1/2(35+5)4²

W = 40*8 =320 j.