Question

When positive work is done on any object, that object’s kinetic energy must necessarily increase. If true, explain why it is true. If false, give a counter example.

Answer 1

Answer: positive work can increase the kinetic energy of a body

Explanation: This is explained in the work energy theoram i. e, the work done on a body is stored as its kinetic energy. This positive work done changes its velocity. If "u" was the initial velocity and "v" is its final velocity. Then,

Work done (W) = Δkinetic energy

= 1/2 mv^2 -1/2mu^2