Question: A (2-mathrm{kg}) block moving at (4 mathrm{~m} / mathrm{s}) hits a slower (1-mathrm{kg}) block moving at (2 mathrm{~m} / mathrm{s}). If the (2-mathrm{kg}) block continues

A $2-\mathrm{kg}$ block moving at $4 \mathrm{~m} / \mathrm{s}$ hits a slower $1-\mathrm{kg}$ block moving at $2 \mathrm{~m} / \mathrm{s}$. If the $2-\mathrm{kg}$ block continues in the same direction at $3 \mathrm{~m} / \mathrm{s},(a)$ what is the speed of the slower block?

(b) Is the collision elastic?

(c) By what factor does the internal energy of the system change?

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