Q: A ball is projected with initial velocity u at Angle Ɵ with horizontal Then, horizontal displacement covered by the ball as it collides third time with the ground would be (coefficient of restitution is e)
(a) $\displaystyle (1 + e) \frac{u^2 sin2\theta}{g} $
(b) $\displaystyle (1 + e + e^2 ) \frac{u^2 sin2\theta}{2 g} $
(c) $\displaystyle e \frac{u^2 sin2\theta}{g} $
(d) $\displaystyle (1 + e + e^2) \frac{u^2 sin2\theta}{g} $
Ans: (d)