Question

A ball thrown by a boy is caught by another after 2 sec. some distance away in the same level. If the angle of projection is ${30}^{\circ }$, the velocity of projection is

• A. 19.6 m/s
• B. 9.8 m/s
• C. 14.7 m/s
• D. None of these

Answer 1

The correct option is A

19.6 m/s

$T=\frac{2usin\theta }{g}\Rightarrow u=\frac{T\times g}{2sin\theta }=\frac{2\times 9.8}{2\times sin30}=19.6m/s$