Question

A girl swings on a cradle in sitting position. If she stands, the time period of cradle :

• A. decreases
• B. increases
• C. remains constant
• D. first ioncreases then it remains constant

Answer 1

The correct option is A decreases

If she stands the center of mass moves up.
Thus the effective length is reduced.
$T=2\pi \sqrt{\frac{l}{g}}$
Thus time period decreases.