Homework Help: Physics

Posted by David on Tuesday, July 1, 2008 at 10:19pm.

A passenger on a train traveling 90km/h on a straight, level track notes that it takes another train (180 m long and moving with constant velocity) 4.0s to pass by. What is the velocity of that passing train relative to the ground?

**please include explanation** thnx!!

Physics - bobpursley, Tuesday, July 1, 2008 at 10:27pm
The relative velocity is the distance divided by the time.

Now subtract the train moving 90km/hr, and you have the other train velocity.

Watch units.
Physics - Bryan, Tuesday, July 1, 2008 at 11:00pm
so:
V = 180 m / 4 s = 45 m/s

convert to km/h

V = 162 km/h

This is the velocity relative to the first train, which is moving 90 km/h relative to the ground.

Then V = 162 + 90 km/h = 252 km/h

That's pretty fast...:-P

Answer this Question

Related Questions

physics - An engineer of a passenger train traveling at 25.0 m/s sights a ...
Physics - the engineer of a passenger train traveling at 25.0 m/s sights a ...
physics - A passenger train is traveling at 30 m/s when the engineer sees a ...
physics - The engineer of a passenger train traveling at 25.0 m/s sights a ...
physics - Cora is a passenger in a car traveling east along a country highway ...
Math - 5) A freight train leaves a station traveling at 32 km/h. Two hours later...
Algebra - A freight train leaves Chicago traveling West at 35 mph. An hour later...
physics - A red train traveling at 72 km/h and a green train traveling at 144 ...
physics - A red train traveling at 72 km/h and a green train traveling at 144 km...
algebra 1b - the speed of a passenger train is 18mph faster than the speed of a ...

For Further Reading

First Name:
School Subject:
Answer: