An object of mass $3 \mathrm{kg}$ is thrown vertically upward with a velocity of $10 \mathrm{m}/\mathrm{s}$. Find
(i) the kinetic energy of the body at the time of throwing,
(ii) its potential energy of the body at the highest point.

Differentiate between work, power and energy.

A force of $200 \mathrm{N}$ acting at an angle of $45°$ to the horizontal does a work of $45000 \mathrm{J}$. Calculate the displacement caused by the force in horizontal direction. (Take $\cos 45°=0 .7071)$