Posted by **Anonymous** on Saturday, November 21, 2009 at 6:45pm.

A 9000 kg boxcar traveling at 17.0 m/s strikes a second boxcar at rest. The two stick together and move off with a speed of 6.5 m/s. What is the mass of the second car?

- Physics -
**MathMate**, Saturday, November 21, 2009 at 8:32pm
If the two cars stuck together, it is an inelastic collision, and energy is not conserved during the collision.

However, momentum is conserved, and since there is only one common final velocity, v, only the momentum equation is enough to solve for the unknown mass.

The equation of conservation of momentum:

m1 v1 + m2 v2 = (m1+m2)v ..... (1)

m1=9000 kg

m2=unknown

v1=17 m/s

v2=0

v=6.5 m/s

Solve for m2.

## Answer this Question

## Related Questions

- Physics - A 9000 kg boxcar traveling at 17.0 m/s strikes a second boxcar at rest...
- Physics - A 9600 kg boxcar traveling at 17 m/s strikes a second boxcar at rest. ...
- Physics - A 9500 kg boxcar traveling at 19 m/s strikes a stationary second car. ...
- physics - 7700-kg boxcar traveling 18m/s strikes a second car. The two stick ...
- physics - A 9600 kg boxcar traveling at 15 m/s strikes a stationary second car. ...
- physics momentum - A 485 kg boxcar traveling at 23 m/s strikes a second car (...
- Physics - A 9500kg car traveling at 16m/s strikes a second car. The two stick ...
- physics - 2.Boxcar A, with a mass of 1500 kg, is travelling at 25 m/s to the ...
- Physics - Boxcar A, with a mass of 1500 kg, is travelling at 25 m/s to the east...
- physics - Boxcar A, with a mass of 1500 kg, is travelling at 25 m/s to the east...