Physics
posted by John .
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?

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.
Respond to this Question
Similar Questions

and
A mass of 29kg is moving to the right at 15m/s. That mass collides with a 25 kg mass that is stationary. The masses stick together after the collision. What is the velocity of the masses after the collision? 
Physics Conservation of Momentum
1) A 1 kg mass moving at 1 m/s has a totally inelastic collision with a 0.7 kg mass. What is the speed of the resulting combined mass after the collision? 
Physics Conservation of Momentum
1) A 1 kg mass moving at 1 m/s has a totally inelastic collision with a 0.7 kg mass. What is the speed of the resulting combined mass after the collision? 
Physics ~really need help!~
1) A 1 kg mass moving at 1 m/s has a totally inelastic collision with a 0.7 kg mass. What is the speed of the resulting combined mass after the collision? 
physics
A block of mass m1 = 2.4 kg initially moving to the right with a speed of 3.3 m/s on a frictionless, horizontal track collides with a spring attached to a second block of mass m2 = 4.1 kg initially moving to the left with a speed of … 
physics
A glider with a mass of 3 kg is moving rightward at a speed of 2 m/s on a frictionless horizontal air track. It collides with a stationary glider whose mass is 18 kg. If the collision is elastic, what is the speed of the gliders after … 
physics
One object is at rest and another is moving. The two collide in a onedimensional, completely inelastic collision. In other words, they stick together and move off with shared velocity. The speed of the object that is moving initially … 
physics
Two blocks are sliding along a frictionless track. Block A (mass 3.73 kg) is moving to the right at 1.50 m/s. Block B (mass 4.48 kg) is moving to the left at 1.80 m/s. Assume the system to be both Block A and Block B. a) what is the … 
Physics
Block B has a mass of 2.20kg and is moving to the left at a speed of 2.30m/s. Block A has a mass of 2.70kg and is moving to the right. The two blocks undergo a perfectly inelastic collision. What should be the velocity of Block A in … 
PHYSICS
Two balls of identical sizes but different masses moving exactly along the same straight line. The left ball (m = 0.5 kg) is moving with a velocity of 2 m/s to the right, and the right ball (m = 0.1 kg) is moving at 0.25 m/s to the …