Question

A rifle is aimed horizontally at a target 55.0 m away. The bullet hits the target 3.00 cm below the aim point

What was the bullet's flight time?

What was the bullet's speed as it left the barrel?

Answer 1

For the vertical displacement of the bullet,
s = ut + 1/2 at², u = 0 in the vertical direction and a = g
0.03 = 1/2 x 9.81 x t²
t = 0.078 s

The total time of flight is 0.078 seconds

Assuming the bullet travels at a constant horizontal velocity,
distance = velocity x time
v = 55 / 0.078
v = 705.1 m/s