Embibe Experts Solutions for Chapter: Work, Energy and Power, Exercise 1: Assam CEE 2017

Two equal masses are attached to two each of a spring of spring constant $k$. The masses are pulled out symmetrically to stretch the spring by a length $x$ over is natural length. The work done by the spring on each mass is

The figure shows the variation of potential energy with distance. The part of the graph which represents the repulsive force is

The motion of a body of mass $0.5 \mathrm{kg}$ due to the application of a force is given as, $x=3t^2+4t+5$ where, $x$ is in metre and $t$ is in second. What is the work done by the force in the first $2$ seconds?