Physics Help Please :(
posted by Jarrid .
Projectile Motion
A rifle is fired horizontally and travels 200m East. The rifle barrel is 1.90m from the ground. What speed must the bullet have been traveling at? Ignore Friction.

First, the motion in the x direction is as simple as x=v*t; so you know that your speed is x/t, or 200/t.
In the y direction you have acceleration, so you need x=v*t+a*t^2
the distance traveled in the y direction is 1.90m (you got x), the velocity is 200/t( you got v, the acceleration is gravity ( you got a), the only thing left is to solve for time, and after that come back to the initial equation v=x/t, and that's it
:)