Question

A body is thrown with a velocity of 9.8 $m{s}^{-1}$ making an angle of ${30}^o$ with the horizontal. It will hit the ground a time :-

• A. $3s$
• B. $2s$
• C. $1.5s$
• D. $1s$

Answer 1

The correct option is D $1s$

We know,

In projectile motion,

Time take to reach back to ground$=\frac{2u\sin \theta }{g}$

$T=\frac{2\times 9.8\times \sin {30}^0}{9.8}=1$

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