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.

Physics Help Please :( 
edguy
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
:)
Respond to this Question
Similar Questions

physics
2. A rifle is fired horizontally and travels 980 m. The rifle barrel is 6.1 m from the ground. What speed must the bullet have been travelling at? 
physics
A rifle is fired horizontally and travels 200.0 m The rifle barrel is 1.90m from the ground. What speed must the bullet have been traveling at? 
physics
A rifle is fired horizontally. The bullet is found to have traveled 200 meters. If the rifle barrel is 1.90 meters above the ground, at what speed must the bullet have been traveling as it left the barrel? 
Physics
An observer stands 43.0 m behind a marksmen practicing at a rifle range. The marksman fires the rifle horizontally which gives the speed of the bullet to be 939 m/s. How far does each bullet travel before the observer hears the report … 
Physics
The barrel of a rifle has a length of 0.916m. A bullet leaves the muzzle of a rifle with a speed of 621m/s. What is the acceleration of the bullet while in the barrel? 
physics
When a bullet leaves a barrel of a rifle, it is moving 640 m/s. If the barrel is 1.20 m long, and if the bullet undergoes constant acceleration while within the barrel, how long after the rifle is fired will the bullet emerge from … 
Physics
A rifle shoots a 4.1g bullet out of it's barrel. The bullet has a muzzle velocity of 975 m/s just as it leaves the barrel. Assuming a constant horizontal acceleration over a distance of 43.0 cm starting from rest, with no friction … 
physics
1) a bullet of mass 0.02 kg is fired into a block of wood of mass 1.5 kg resting on a horizontal table. The block moves offwith an initial speed of 8 m/s. Estimate the speed with the bullet strikes the block. 2) The bullet in question … 
physics
The barrel of a rifle has a length of 0.976 m. A bullet leaves the muzzle of a rifle with a speed of 561 m/s. What is the acceleration of the bullet while in the barrel? 
Physics
When an 8lb rifle is fired, the 0.02lb bullet receives an acceleration of 10^5 ft/s^2 while it is the barrel?