Question

A ball is thrown with a speed of 40 m/s on elevation angle $30$ from the horizontal ground. Find its time of flight.

• A. 2 s
• B. 4 s
• C. 6 s
• D. 8 s

Answer 1

The correct option is B 4 s

Given,

$\theta ={30}^0$

$u=40m/s$

Let time of flight$=T$

We know,

$T=\frac{2u\sin \theta }{g}$

$T=\frac{2\times 40\times 0.5}{10}=4s$

Option $\text{B}$ is the correct answer