Determine how fast is dan going as his feet hit the ground

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Dan is gliding on his skateboard at 4.00 m/s. He suddenly jumps backward off the skateboard, kicking the skateboard forward at 6.00 m/s (as measured by an observer on the ground). Dan's mass is 70.0 kg and the skateboard's mass is 7.00 kg. How fast is Dan going as his feet hit the ground?

Reference no: EM13335082

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