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A man holding a rock sits on a sled that is sliding across a frozen lake...

A man holding a rock sits on a sled that is sliding across a frozen lake (negligible friction) with a speed of 0.490 m/s. The total mass of the sled, man, and rock is 97.5 kg. The mass of the rock is 0.320 kg and the man can throw it with a speed of 17.0 m/s. Both speeds are relative to the ground. Determine the speed of the sled in m/s if the man throws the rock forward (i.e. in the direction the sled is moving).

What is the speed of the sled in the previous question if the rock is thrown in the opposite direction?

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