When a boy is playing on a swing in the sitting position , the time period of oscillations of the swing is T. If the boy stands up , the time period of oscillation of the spring will be

Options

A. more than T
B. less than T
C. equal to T
D. Cannot be predicted

Answer

B

Explanation

(b) As the boy stands up , the gravity of the pendulum is raised up , decreasing the effective length of the pendulum of the swing and hence the time period T decreases.