question_answer 16)

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:

Mass of the object, m = 20 kg Total work done by the force = Change in the kinetic energy of the object                                                                                                                                                                  The force will do work equivalent to 210 J. Here the direction of force is opposite to the direction of motion.