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

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(c) in accelerated motion

Explanation:

Acceleration is the measure of how fast the velocity changes. Velocity is a vector quantity and a change in velocity is due to change in magnitude or change in direction or both.

Here, the boy is moving with constant speed but velocity changes and hence is supposed to be in accelerated motion.

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

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