question_answer 41)

                  The displacement time graph of a particle executing S.H.M. is shown in fig. Which of the following statement is/are ture?                 (a)The force is zero at \[t=\frac{3T}{4}\]                 (b) The acceleration is maximum at \[t=\frac{4T}{4}\]                 (c) The velocity is maximum at \[t=\,\frac{T}{4}\]                 (d) The P.E. is equal to K.E. of oscillation at \[t=\,\frac{T}{2}\]

Answer:

                  (a, b, c) Velocity is maximum at mean position, while acceleration is zero. On the other hand, acceleration is maximum at extreme position, while velocity is zero.