A ball falls from a height h1 and rebounds to the height h2. The coefficient of restitution is :

Q: A ball falls from a height h1 and rebounds to the height h2. The coefficient of restitution is :

(a) $\frac{h_1}{h_2}$

(b) $ (\frac{h_1}{h_2})^{1/2}$

(c) $\frac{h_2}{h_1}$

(d) $ (\frac{h_2}{h_1})^{1/2}$

Ans: (d)