The displacement time graph of a particle executing S.H.M. is shown in Fig. Which of the following statement is/are true?
Options:
(a) The force is zero at `t=(3T)/4` .
(b) The acceleration is maximum at `t=(4T)/4`
(c) The velocity is maximum at `t=T/4` .
(d) The P.E. is equal to K.E. of oscillation at `t= T/2 ` .