Question

Consider a track having frictional coefficient $\mu$. A block of mass $m$ is released from point $P$ situated at height $h$. Which of the following is correct?

• A. It can reach at $V$
• B. It cannot reach at $V$
• C. It can reach at $V$, if $\mu$ is reduced to $\mu /2$
• D. It can reach at $V$, if $\mu$ is increased to $2\mu$

Answer 1

The correct option is B It cannot reach at $V$

The block can reach at $V$ only when there is no loss in kinetic energy.
In this case, due to presence of friction dissipation of energy will take place.
Thus, the particle cannot react at $V$.