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physics

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A 41.2 kg student runs down the sidewalk and
jumps with a horizontal speed of 4.36 m/s onto a stationary skateboard. The student and skateboard move down the sidewalk with a speed of 4.12 m/s.
a. Find the mass of the skateboard (in kg)
b. How fast would the student have to jump to have a final speed of 5.76 m/s? (in m/s)

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