Question

A toy gun is aimed horizontally at a target on a wall X meters away. The plastic bullet hits Y

meters below the target. What was the initial speed of the bullet in meters per second?

Assume that g = 10 m/s?

Answer 1

The initial speed is

$$v=X/t=\frac{X\sqrt g}{\sqrt{2Y}}=2.236\frac{X}{\sqrt Y}$$