A rock is dropped from high above the surface of the Earth. The initial speed is 0, and the initial height above the surface is NXRE where RE is the radius of the Earth. Calculate the speed of the rock when it hits the upper atmosphere, say at height 20 km above the surface. DATA for the Earth: radius RE = 6.38 x 106 m; mass ME = 5.98 x 1024 kg. N = 15; (in m/s)

# A rock is dropped from high above the surface of the Earth. The initial speed is 0, and the initial height above the surface is NXRE where RE is the radius of the Earth. Calculate the speed of the rock when it hits the upper atmosphere, say at height 20 km above the surface. DATA for the Earth: radius RE = 6.38 x 106 m; mass ME = 5.98 x 1024 kg. N = 15; (in m/s)

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