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 aluminum sphere of mass is $3.5 \mathrm{kg}$. Both spheres are dropped simultaneously from a tower. When they are $10 \mathrm{m}$ above the ground, they have the same

The work done on an object does not depend upon the