A pole-vaulter falls from a height of about 6.0 meters onto a foam rubber pad. Can you calculate his speed just before he reaches the pad? Can you calculate the force exerted on him by the pad?
1.With the given information you can calculate his final speed and you can calculate the force that the pad exerts upon him.
2.With the given information you cannot calculate his final speed but you can calculate the force that the pad exerts upon him.
3.With the given information you can calculate his final speed but you cannot calculate the force that the pad exerts upon him.
4.With the given information, you cannot calculate either his final speed nor the force that the pad exerts upon him.
Question 2
You have a piece of clay and a rubber ball, both of the same mass. You want to close a door on the other side of the room by throwing either the clay or the rubber ball at the door. Assume that both would be thrown with the same speed and would impact the door at the same point on the door. With which would you be more likely to cause the door to close further?
1.the rubber ball
2.the clay ball
3.Both would cause the door to close the same distance.
4.It is impossible to tell.
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