A child is swinging a swing. Minimum and maximum heights of swing from the earth's surface are 0.75

Question

A child is swinging a swing. Minimum and maximum heights of swing from the earth's surface are 0.75 m and 2 m respectively. The maximum velocity of this swing is

Professor PC Thomas Classes · Answer

$\Delta PE = \Delta KE \Rightarrow mg(2 - 0.75) = \frac{1}{2}mv^2 \Rightarrow v = \sqrt{2 	imes 10 	imes 1.25} = 5$ m/s.