Dan is gliding on his skateboard at 2.0 m/s . He suddenly jumps backward off the skateboard, kicking the skateboard forward at 6.0 m/s (as measured by an observer on the ground). Dan's mass is 50 kg and the skateboard's mass is 7.0 kg .   How fast is Dan going as his feet hit the ground? Express your answer using two significant figures.

Principles of Physics: A Calculus-Based Text
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Author:Raymond A. Serway, John W. Jewett
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Chapter8: Momentum And Collisions
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Dan is gliding on his skateboard at 2.0 m/s . He suddenly jumps backward off the skateboard, kicking the skateboard forward at 6.0 m/s (as measured by an observer on the ground). Dan's mass is 50 kg and the skateboard's mass is 7.0 kg .

 

How fast is Dan going as his feet hit the ground?
Express your answer using two significant figures.
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