Engineering Properties of Grains

The restitution coefficient $e$ of a seed dropped from height $h_1$ that rebounds to height $h_2$ on a steel plate is given by:

Options:

• (A) $e = \sqrt{\frac{h_2}{h_1}}$
• (B) $e = \frac{h_2}{h_1}$
• (C) $e = \left(\frac{h_2}{h_1}\right)^2$
• (D) $e = \frac{h_1 - h_2}{h_1}$