Watch this physics video on kinetic enegy and answer the questions: http://media

Question

Watch this physics video on kinetic enegy and answer the questions:

http://media.pearsoncmg.com/aw/aw_0media_physics/vtd/video17.html

Part A

Imagine that you replace the block in the video with a happy or sad ball identical to the one used as a pendulum, so that the sad ball strikes a sad ball and the happy ball strikes a happy ball. The target balls are free to move, and all the balls have the same mass. In the collision between the sad balls, how much of the balls' kinetic energy is dissipated?

None of it

Part B

Now, consider the collision between two happy balls described in Part A. How much of the balls' kinetic energy is dissipated?

Now, consider the collision between two happy balls described in Part A. How much of the balls' kinetic energy is dissipated?

None of it

Part B

Now, consider the collision between two happy balls described in Part A. How much of the balls' kinetic energy is dissipated?

Now, consider the collision between two happy balls described in Part A. How much of the balls' kinetic energy is dissipated?

Explanation / Answer

Part A: Half of it.

Part B: None of it

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