A child is sitting on a swing. Its minimum and maximum heights from the ground 0.75 m and 2 m respec

Question

A child is sitting on a swing. Its minimum and maximum heights from the ground 0.75 m and 2 m respectively, its maximum speed will be\

Professor PC Thomas Classes · Answer

(b) : Maximum drop in P.E. $=$ maximum gain in K.E.\ $m g(2-0.75)=\frac{1}{2} m v^{2} \Rightarrow v=\sqrt{2 g(1.25)}=5 \mathrm{~m} / \mathrm{s}$