Question

The initial speed of a bullet fired a rifle is 630 m/s. The rifle is fired at the centre of a target 700 m away at the same level as the target. How fwr above the centre of the target the rifle be aimed in order to hit the target?

• A. 1.0 m
• B. 4.2 m
• C. 6.1 m
• D. 9.8 m

Answer 1

The correct option is C 6.1 m

$Uof$ bullet=$630m/s$

$d=700m$

assuming acceleration to be =$0$

$700=630t$

$t=\frac{10}{9}s$

$h=\frac{1}{2}g{t}^2$

$=\frac{1}{2}\times 100\times \frac{100}{81}$

$6.1m$