When a 78.0 kg skateboarded passes point P, his mechanical energy is 3.68 x 10^3 J relative to the ground.When he passes point Q he is moving at 8.15 m/s. How high is the skateboarder (relative to the ground) at point Q? Assume that the skateboard rolls with

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When a 78.0 kg skateboarded passes point P, his mechanical energy is 3.68 x 10^3 J relative to the ground.When he passes point Q he is moving at 8.15 m/s. How high is the skateboarder (relative to the ground) at point Q? 

Assume that the skateboard rolls with negligible friction. 

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