Conservation of Momentum Answers

Two objects of mass m move in opposite directions toward each other. The green object moves at velocity v, and the blue object moves at velocity 2v. Which diagram correctly shows the direction and velocity for each of the objects after an elastic collision?

Identify the conditions for an elastic collision in a closed system. Check all that apply.Energy is conserved.Velocities may change.Momentum is conserved.Kinetic energy is conserved.Objects stick together after the elastic collision.One object may be stationary before the elastic collision.

Consider a system to be two train cars traveling toward each other.

Consider a system to be two train cars traveling toward each other.

2,400✔ 1,600–800–1,600

Train car A is at rest when it is hit by train car B. The two cars, which have the same mass, stick together and move off after the collision. How does the final velocity of train cars A and B after the collision compare to the initial velocity of train car B before the collision?

Consider a system to be one train car moving toward another train car at rest. When the train cars collide, the two cars stick together.What is the total momentum of the system after the collision?

Two billiard balls move toward each other on a table. The mass of the number three ball, m1, is 5 g with a velocity of 3 m/s. The mass of the eight ball, m2, is 6 g with a velocity of 1 m/s. After the balls collide, they bounce off each other. The number three ball moves off with a velocity of 5 m/s. What is the final velocity and direction of the eight ball?

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