# Voting Question: If a car is travelling at 100MPH and a bullet is fired at 100mph muzzel speed.?

• Voting Question: If a car is travelling at 100MPH and a bullet is fired at 100mph muzzel speed.?

Answer #1 | 22/12 2013 02:40
That's a lame gun you have there. From where is the gun fired? By the driver, out of the window at a car in front, for instance? If so, then to an observer in the car, the bullet moves forwards at 100mph. Say the target car in front is only doing 50mph, then the bullet effectively hits it at 150mph, because the bullet was already going 50mph faster than the car when it was fired, adding 100mph to it. Say the car in front is a real fast one, doing 150mph, getting away from the gunman behind... the bullet will effectively struggle to catch the leading car, only hitting it at 50mph and doing little damage. This is all Newtonian Mechanics, but you have to consider the RELATIVE speeds involved. Einstein told us that these were 'frames of reference' the Cops in the car shooting at the faster or slower bank-robber in the front car. A boy on a train travelling at 60mph tosses a golf ball just a foot up into the air above his hand. To HIM, it comes straight back down again, and doesn't move forwards or back. RELATIVE to an Observer on a railway platform, he sees the train, the boy and the ball all moving at 60mph. Relativity is why the ball doesn't SLAM!! into the back of the carriage at 60mph!
Positive: 62 %
Answer #2 | 22/12 2013 03:44
First problem - the speed of a bullet is more like 700 mph than 100 mph. The bullet would leave the barrel of the gun at a speed of 200 mph - and will then immediately start slowing due to wind resistance: the car has an engine to keep it moving, the bullet doesn't.
Positive: 56 %
Answer #3 | 22/12 2013 05:07
If the car and bullet were traveling in the same direction the bullet would appear stationary relative to the car. If the bullet and car were traveling towards each other they would collide with the force of 100MPH...not 200 MPH as commonly thought. Mythbusters proved that the force of impact is not double the velocity.
Positive: 36 %
Answer #4 | 22/12 2013 05:12
Hi a bullet would drop to the ground at such a slow speed. it would not sustain height. 500 feet per second is the minimum a bullet travels at.
Positive: 4 %
Answer #5 | 22/12 2013 08:38
You have not specified the direction in which the bullet is fired. If the bullet is fired in the same direction as the car is travelling the absolute speed of the bullet as it leaves the muzzle will be 200 mph. If it is fired directly to the rear of the car the absolute speed will be zero. (It will then drop to the ground at the point at which it was fired, although the car continues on its way.)
Positive: 10 %

physics homework help, ... A rifle bullet with a muzzle speed of 330 m/s is fired directly into a special ... if the traveling speed of the car ...
Positive: 62 %
... or match the other cars speed? ... same size both projected horizontally at 100 mph. ... rate as the acceleration of bullet fired at muzzle ...
Positive: 57 %
... the dropped bullet hits just slightly ahead of the fired bullet—a ... as one car traveling at 100 mph ... of a car at half the speed.