A very elastic “superball” is dropped from a height h onto ahard steel plate (fixed to the Earth), from which it reboundsat very nearly its original speed. (a) Is the momentum of theball conserved during any part of this process? (b) If weconsider the ball and the Earth as our system, during whatparts of the process is momentum conserved? (c) Answerpart (b) for a piece of putty that falls and sticks to the steelplate.

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