Question

Certain force acting on a 20 kg mass changes its velocity from 5 ms^-1 to 2 ms^-1. Calculate the work done by the force.

Answer 1

Mass, m = 20 kg.
Initial velocity, u = 5 ms^-1
Final velocity v = 2 ms^-1
Work done by the force = change in kinetic energy
= Final kinetic energy – Initial kinetic energy