Posted by **Angel** on Sunday, January 22, 2012 at 5:38pm.

A 42.5 kg student runs down the sidewalk and

jumps with a horizontal speed of 4.16 m/s

onto a stationary skateboard. The student

and skateboard move down the sidewalk with

a speed of 3.97 m/s.

a) Find the mass of the skateboard.

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