Posted by **alejandro** on Monday, March 10, 2014 at 2:24am.

After performing a trick above the rim of a skateboard ramp, a 56 kg skateboarder lands on the ramp 3.5 m above ground level with a downward velocity of 4.0 m/s.

Ep = 0.0 J Ground level. Friction in the wheels of the skateboard and air resistance cause a loss of 9.0 × 10^2 J of mechanical energy. The skateboarder’s speed at the bottom of the ramp will be_____m/s.?

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