Physics
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A skateboarder performs a trick where he jumps over a barrier. A slow-motion video shows that the center of mass of the skateboarder rises 0.80 m from the launch point to the top of the arc. If he is moving at 4.0 m/s at the apex of his jump, what is his minimum speed at launch?
In a competition to advance renewable energy technologies, a solar-powered glider with a mass of 850 kg, including the pilot, is launched from a height of 2000 m above sea level. It attains a forward speed of 350 km/h under optimal conditions. Due to air resistance and the design of the glider, it lands with a speed of 150 km/h. If there had been no air resistance, what would the glider's landing speed have been?