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What speed must Superman attain

 
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munusumi
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Joined: 11 Oct 2010
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PostPosted: Tue Oct 19, 2010 7:21 am    Post subject: What speed must Superman attain Reply with quote

What speed must Superman attain in order to escape from the Earth's gravitational pull? Superman (99 kg) is often seen to fly up and away from the Earth's atmosphere. In order to accomplish this feat, Superman's kinetic energy (0.5mv2) must at least be equal to the gravitational potential energy at the Earth's surface (GmM/r). If the Earth's radius is 6,378,100 meters and its mass is 5.9742 x 1024 kg, calculate the speed Superman must attain in order to escape from the Earth's gravitational pull. Is this speed dependent on Superman's mass?
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NyaR
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PostPosted: Tue Feb 22, 2011 10:47 am    Post subject: Reply with quote

im sure it would surpass 9000
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