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Calculate the escape speed from the surface of Charon.

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ve = (2GM/r)1/2

Mass of Charon (M) = 1.77 × 1021kg 

Radius of Charon (r) = 595 km

ve = ((2 x 6.67 x 10-11 x 1.77 x 1021)/(595 x 103))1/2

ve = (0.03968 × 107)1/2 = 629.9m/s

ve = 0.630 km/s

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