The displacement-time graph of a particle executing SHM is shown in figure. Which of the followi...

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The displacement-time graph of a particle executing SHM is shown in figure. Which of the following statement is/are incorrect?
(a) The force is zero at \( t=\frac{3 T}{4} \).
(b) The acceleration is maximum at \( t=\frac{4 T}{4} \).
(c) The velocity is maximum at \( t=\frac{T}{4} \).
(d) The PE is equal to \( \mathrm{KE} \) of oscillation at \( t=\frac{T}{2} \).
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