Question

A rifle is aimed horizontally at a target 46 m away. the bullet hits the target 2.0 cm below the aim point. (a) what was the bullet's flight time?

Answer 1

The bullet falls with an acceleration of 9.81m/s^2. Its velocity is then 9.81t. Its position function in the vertical direction is (9.81/2)t^2. Since it fell 0.02m, we solve for t.
4.905t^2=0.02
t=sqrt(0.02/4.905)=0.06385s