Question

A stone is projected at an angle $\theta$ with velocity u to hit a vertical wall at a distance b. If after collision at wall it returns to point of projection, the co-efficient of restitution is given by

• A. $\frac{usi{n}^2\theta -b}{usi{n}^2\theta +b}$
• B. $\frac{1}{2}$
• C. $\frac{bg}{u^{2}sin2\theta -bg}$
• D. $u^{2}sin\theta -b$

Answer 1

The correct option is C $\frac{bg}{u^{2}sin2\theta -bg}$

$\frac{b}{ucos\theta }+\frac{b}{eucos\theta }=\frac{2usin\theta }{g}$