Question

A child swinging on a swing in sitting position, when she stands up then the time period of the swing will. A. Increase. B. Decrease. C. Remains same.

Answer 1

The period will decrease.

T (period) = 2 π (L / g)^1/2 period of simple pendulum

As the length of a simple pendulum decreases its period of motion will also decrease (it will swing faster)