A bullet is to be fired with a speed of `2000 m//s` to hit a target `200 m` away on a level ground. If `g = 10 m//s^(2)`, the gun should be aimed

Options

A. directly at the target
B. 5cm below the target
C. 5 cm above the target
D. 2 cm above the target

Answer

c

Explanation

The bu llet will reach the target in time `t=(x)/(u)=(200)/(2000)=0.1s`.
During this time, the bu llet will be below the aimed target by distance y given by
`y=(1)/(2)g t^(2)=(1)/(2)xx10xx(0.1)^(2)`
=0.05m=5m