Suppose a boy is enjoying a ride on a merry-go-round which is moving with a constant speed of 10 ms–1. It implies that the boy is:
(a) at rest
(b) moving with no acceleration
(c) in accelerated motion
(d) moving with uniform velocity
Velocity is a vector quantity, which has direction as well as magnitude.
In merry-go-round, even the boy is moving with constant speed, the direction of velocity keep on changing.
Hence, we can say velocity of the boy is changing.
The quantity, which changes the velocity is called acceleration.
Therefore, the boy must be in accelerated motion.
Hence the correct option of this question is C.