Fig. 14.23 depicts four x-t plots for linear motion of a particle. Which of the plots represent periodic motion? What is the period of motion (in case of periodic motion) ?

Options

A.
B.
C.
D.

Explanation

(b) and (d) are periodic, each with a period of 2 s, (a) and (c) are not periodic. [Note in (c), repetition of merely one position is not enough for motion to be periodic, the entire motion during one period must be repeated successively].