H C Verma Solutions for Chapter: Work and Energy, Exercise 2: OBJECTIVE I

A heavy stone is thrown from a cliff of height $h$ with a speed $v$. The stone will hit the ground with maximum speed if it is thrown

Two springs $A$ and $B$ $(k_A= 2k_B)$ are stretched by applying forces of equal magnitudes at the four ends. If the energy stored in $A$ is $E$, then that in $B$ is

Two equal masses are attached to the two ends of a spring of spring constant $k$. The masses are pulled out symmetrically to stretch the spring by a length $x$ over its natural length. The work done by the spring on each mass is

The negative of the work done by the conservative internal forces on a system equals the changes in

The work done by the external forces on a system equals the change in

The work done by all the forces (external and internal) on a system equals the change in

____________ of a two particle system depends only on the separation between the two particles.

The most appropriate choice for the blank space in the above sentence is

A small block of mass $m$ is kept on a rough inclined surface of inclination $\theta$ fixed in an elevator. The elevator goes up with a uniform velocity $v$and the block does not slide on the wedge. The work done by the force of friction on the block in time $t$ will be