A teen of mass m = 64 kg travels at a velocity vi = 1.55 m/s before jumping on a skateboard. After jumping on the board the teen has a velocity vf = 1.42 m/s. a)What is the mass of the skateboard in kilograms?  b)The teen soon loses his balance and falls backwards off the board at a velocity of 1.0 m/s. Assuming momentum is conserved in this process, what is the skateboard's new velocity in meters per second? [Note: this may not be a very good assumption, as there can be significant friction in the ball bearings of the skateboard]

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