Dr. S K Jain and Dr. Shailesh K Jain Solutions for Chapter: Work, Energy and Power, Exercise 4: NCERT Exemplar Questions

A car is accelerated on a levelled road and attains a velocity four times of its initial velocity. In this process the potential energy of the car :

In case of negative work, the angle between the force and displacement is :

An iron sphere of mass $10 \mathrm{kg}$ has the same diameter as an aluminium sphere of mass $3.5 \mathrm{kg}$. Both spheres are simultaneously dropped from a tower. When they are $10 \mathrm{m}$ above the ground, then they have the same:

A girl is carrying a school bag of mass $3 \mathrm{kg}$ on her back and moved $200 \mathrm{m}$ on a levelled road. The work done against the gravitational force would be : ($g=9.8 \mathrm{m} {\mathrm{s}}^{-2}$)

Which of the following is not a unit of energy?

The work done on an object does not depend upon the: 

Water stored in a dam possess:

A body is falling from a height $h$. After it has fallen a height $\frac{h}{2}$, it will possess: