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

Area under force-displacement graph is equal to

A weight lifter is holding a weight of $80\mathrm{kg}$ on his shoulder for $10 \mathrm{s}$. Work done by the lifter is

A man pulls a bucket out of a well by means of a rope. The work done by the gravity is

A block of mass $0.1\mathrm{kg}$ slides down a rough inclined plane. If the speed of the block decreases from $10 \mathrm{m} {\mathrm{s}}^{-1}$ to $5 \mathrm{m} {\mathrm{s}}^{-1}$, the thermal energy developed in the process is

A particle of mass '$m$' moving with a speed ' $v$' strikes a stationary particle of mass '$2 \mathrm{m}$' and sticks to it. The speed of the system after collision will be

If the velocity of the body becomes double, its kinetic energy will become.

Read the passage and answer the following question.

When a particle moves in a horizontal circle with uniform speed, its kinetic energy remains the same everywhere. Now the particle moves in a vertical circle of radius $r$.

The kinetic energy of the particle of mass m at the lowest point of the vertical circle is

A body is moving unidirectionally under the influence of a source of constant power. Its displacement in time '$t$' is proportional to