(Answered) A boy on a skateboard coasts along at 60 ms he has a ball

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A boy on a skateboard coasts along at 6.0 m/s. He has a ball that he can throw at a speed of 10 m/s.

1) What is the ball's speed relative to the ground if he throws the ball forward?

2)What is the ball's speed relative to the ground if he throws the ball backward?

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