S K Sharma Solutions for Chapter: Work, Energy & Power, Exercise 2: UNSOLVED NUMERICALS FOR PRACTICE

Calculate the kinetic energy of a body of mass $50 \mathrm{kg}$ moving with $5 \mathrm{m} {\mathrm{s}}^{-1}$.

A body of mass $5 \mathrm{kg}$ is moving with a velocity $10 \mathrm{m}/\mathrm{s}$. Find its kinetic energy. Find the ratio of initial kinetic energy and final kinetic energy if ($a$) its mass is doubled. ($b$) its velocity is made three times.

A moving body of mass $10 \mathrm{kg}$ has $20 \mathrm{J}$ of kinetic energy. Calculate its speed.

Calculate the change that should be affected in the velocity of a body to maintain the same kinetic energy, if the mass of the body is increased to four times.

A certain force acts on a body of mass $10 \mathrm{kg}$ and changes its velocity from $2 \mathrm{m} {\mathrm{s}}^{-1}$ to $5 \mathrm{m} {\mathrm{s}}^{-1}$. Calculate the work done by the force.