Question

The force has been applied on a mass of 20kg which for which its velocity becomes 5 M per second from 2 m per second find the velocity of work done by force applied

Answer 1

According to the work-energy conversion theorem;
Work done by the force = Change in Kinetic energy
Work done by the force = (1/2)*m*(v2 - u2)
Work done = 0.5*20*(4–25) = -210 J
Since work done by the force is opposite to the direction of velocity, the work done by the force is negative!