Question

which of these does not show periodic motion
a. a girl swinging
b. bob of a pendulum
c. a moving train
d. strings of a guitar​

Answer 1

Answer:

(c) moving train .

I guess

Explanation:

agar sai hai to thank kar de na

Answer 2

C. A moving train.

Explanation:

Periodic motion is a type of motion of an object which is characterized by the repetition of the movement over a fixed period or fixed time interval. The repetition interval of the moving object is known as the time period.

The best example of the periodic motion is the earth's revolution around the sun. The other examples are pendulum, string, and swing.

While a running train continues in a single direction and this is the reason why a running train's motion is not a type of periodic motion.