Posted by **Nelly** on Wednesday, February 23, 2011 at 1:04am.

A railway track travelling along a level at 9 m/s collides with, and becoms coupled to a stationary truck. Find the velocity of the coupled trucks immediately after the collision if the stationary truck has a mass which is :

A ) equal to the mass of the moving truck

B) twice the mass of the moving truck

- physics -
**drwls**, Wednesday, February 23, 2011 at 5:57am
I assume that your 9 m/s speed refers to a "truck" (railcar) on the track. You wrote that the track is moving.

In both cases, apply the law of conservation of momentum. Let M be the mass of the initially moving truck

In the first case,

M*V1 = (2M)*Vfinal

Vfinal = (V1)/2 = 4.5 m/s

In the second case,

M*V1 = (M + 2M)*Vfinal = 3M*Vfinal

Vfinal = ___

## Answer This Question

## Related Questions

- physics - 1) What average power is required for a runner with a mass of 85 kg to...
- Physics 30 - a 2000kg car traveling east at 24m/sec enters an icy (frictionless...
- physics - A truck of mass 1.0 tonne moving at 4.0 m/s catches up and collides ...
- physics - truck A of mass 2,5 x 10(4) kg approaches a second truck B of mass 2 x...
- physics - A cannon on a stationery railway truck fires a shell of mass 5 kg with...
- physical science - A 3000-kg car bumps into a stationary, 5000-kg truck. The ...
- physics - A 2000 kg truck is at rest at a stop sign. A 1100kg car collides head-...
- physics - A 2000 kg truck is at rest at a stop sign. A 1100kg car collides head-...
- physics momentum - a trolley of mass 200kg is travelling north at 2m\s. It ...
- math - A 1000·kg car traveling with a velocity of 13·m/s north collides head-on ...

More Related Questions