The red ball in the diagram is chasing after the blue ball. The speed of the red ball is 3 m/s the speed of the blue ball is 2 m/s. After the collision the red ball rebounds at 2 m/s and the blue ball speeds away at 3 m/s. What was the change in velocity experienced by the red ball during the collision? What was the change in velocity experienced by the blue ball during the collision? If the mass of the red ball is the same as the mass of the blue ball, was momentum conserved during this collision?

Estimate the force on a 145 gram baseball if it hits the bat at 50 miles per hour, stays in contact with the bat for 0.1 second during which time it reverses direction and leaves the bat at 75 miles per hour.
Express the result in newtons and in pounds.

Suppose the shuttle were launched from a launch pad on the Moon. What changes would we observe?

Suppose it were launched from a launch pad in space in vacuum. Would it work? What changes would we observe?

A red ball is propelled forward and collides with a blue ball initially at rest. After the collision, the balls' trajectories are as shown in the diagram. How do the masses of the two balls compare? Briefly explain your answer.