1. A series of 5 metal balls (all of identical size and mass hang from strings in a straight line in such a manner that when at rest, they are just touching each other. Three of the balls are pulled back as a group a distance of 20 cm along the line of balls and released. When they strike the remaining two balls which are motionless, the three balls will stop moving and the force will be transmitted to the remaining two balls in the collision, causing the two balls to swing away from the three balls which remain motionless after the collision.

True or False

2. When jumping from a height, landing on a foam pad decreases the likelihood of injury compared to landing on a hard floor by:

	A.	Decreasing the average force necessary to remove all of the person's momentum
	B.	Increasing the amount of time over which all of the person's moment is removed
	C.	Decreasing the momentum of the person at the time of impact
	D.	More than 1 of the above
	E.	All of the above