Question

prove that the work done by a force is equal to the change in kinetic energy?

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Answer 1

• The work-energy theorem states that the work done on a body is equal to the change in kinetic energy of the body. Suppose a body of mass 'm' is under an acceleration 'a' due to which its initial speed 'u' at time t = 0 becomes final velocity 'v' at time t = t.

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Answer 2

The work W done by the net force on a particle equals the change in the particle's kinetic energy KE: W=ΔKE=12mv2f−12mv2i W = Δ KE = 1 2 mv f 2 − 1 2 mv i 2 .