17. A skateboarder is going 10 m/s the instant it is launched vertically off a ramp. If the mass of the skateboarder is 50 kg, how high above the ramp can he possibly go? If the mass of the skateboarder is 100 kg, how high above the ramp can he possibly go? If the speed of the skateboard is 20 m/s when it is launched how high above the ramp can he possibly go? (5.1m, 5.1m, 20.4m)