A skateboarder moves off from rest from the top of a ramp and passes through the point with a speed of 2 m s-1. The point is 4 m vertically below .
Assuming that there is no resistance to motion, find the speed with which the skateboarder passes through .
Assuming instead that there is a constant resistance to motion, and that the work done against this resistance is 333 J, find the speed with which the skateboarder passes through if the skateboarder and equipment can be modelled as a particle of mass 60 kg.
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