Question

A bomb is dropped from an aeroplane flying horizontally with a velocity of $720km/h$ at an altitude of $980m$. Time taken by the bomb to hit the ground is

• A. $1s$
• B. $7.2s$
• C. $14.14s$
• D. $0.15s$

Answer 1

The correct option is C $14.14s$

We know, $h=ut+\frac{1}{2}g{t}^2$

$u=0$, $h=980m$

$\Rightarrow t=\sqrt{\frac{2h}{g}}=\sqrt{\frac{2\times 980}{9.8}}$$=14.14sec$