MCQ
The given graph illustrates a transverse wave travelling on a string at a particular instant, and the points $P, Q, R$ and $S$ represent elements of the string. Which of the following statements about the motion of the elements is correct?


- AThe speed of the element at $P$ is a maximum
- BThe displacement of the element at $Q$ is always zero.
- CThe energy of the element at $R$ is entirely kinetic
- ✓The acceleration of the element at $S$ is maximum.

