Question

A cricket ball is thrown at a speed of $56{ms}^{-1}$ in a direction making an angle ${30}^o$ with the horizontal. Calculate (a) maximum height, (b) Total time taken by the ball to return to the ground and (c) The distance from thrower to the point where the ball returns to the earth.

Answer 1

it is the case of projectile hence,

1. For maximum heigt : $H=\frac{u^2\sin \theta }{2g}={56}^2\times 0.5/20=78.4m$
2. Time of flight, $T=\frac{2u\sin \theta }{g}=\frac{2\times 56\times 0.5}{10}=5.6s$
3. Range, $R=\frac{u^2\sin 2\theta }{g}=\frac{{56}^2\times \sqrt{3}/2}{10}=271.5m$