Posted by John on Monday, October 12, 2009 at 11:41pm.
A 2.0 kg mass is moving to the right at 3.0 m/s . A 4.0 kg mass is moving to the left at 2.0 m/s.
A) If after the collision the two masses join together what is their velocity after the collision?
3.0 X 2.0 = 6m/s. Is this correct?
B)Is this a elastic or inelastic collision?
Elastic. Is this correct?

Physics  MathMate, Tuesday, October 13, 2009 at 8:21am
3.0 X 2.0 = 6m/s. Is this correct?
The unit is not correct: 3 kg * 2 m/s gives 6 kgm/s.
This is not the answer, but the momentum of the left mass.
Calculate the momentum of the right mass and add to that of the left (watch the sign) to get the total momentum.
Divide the total momentum by the total mass to get the velocity after the inelastic impact.
An elastic impact is like bouncing a superball on the wall, and an inelastic impact is like dropping mashed potatoes on the floor. Hope you get the idea.
Answer This Question
Related Questions
 and  A mass of 29kg is moving to the right at 15m/s. That mass collides with a ...
 Physics Conservation of Momentum  1) A 1 kg mass moving at 1 m/s has a ...
 Physics Conservation of Momentum  1) A 1 kg mass moving at 1 m/s has a ...
 PHYSICS  Two balls of identical sizes but different masses moving exactly along...
 Physics ~really need help!~  1) A 1 kg mass moving at 1 m/s has a totally ...
 physics  A glider with a mass of 3 kg is moving rightward at a speed of 2 m/s ...
 physics  Two blocks are sliding along a frictionless track. Block A (mass 3.73 ...
 physics  One object is at rest and another is moving. The two collide in a one...
 physics  We have two carts moving towards each other at different speeds ...
 Physics  Block B has a mass of 2.20kg and is moving to the left at a speed of 2...
More Related Questions