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
DThe acceleration of the element at $S$ is maximum.
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DThe acceleration of the element at $S$ is maximum.
d Acceleration is maximum at extreme position. Velocity is maximum at mean position.
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