A boy is sitting in a merry-go-round which is moving with a constant speed of 10 m/s. This means that the boy is A) at rest B) moving with no acceleration C) in accelerated motion D) moving with uniform velocity.

The answer would be the option (iii).

The boy is moving constantly at a speed of 10 m/s and since the direction is the same therefore the boy is moving at an accelerated motion.

Since the boy is constantly changing its velocity by a constant amount therefore it is accelerated motion. As the body is moving in a circular motion, the velocity of the body is kept on changing but a change in its direction.