physics question! escape velocity???

The escape velocity from planet A is double that for planet B. The two planets have the same mass.

What is the ratio of their radii r A / r B?

r A / r B =_________

2 Answers

  • Ve = sqrt (2GM/r)

    Ve.a = 2Ve.b

    Ve.a/Ve.b = 2 = sqrt (r.b/ra)

    r.a/r.b = 1/2^2 = 1/4

  • Here is your equation:

    escape velocity = sq root(GM/r)

    G and M are both constants here. Can you figure out the ratio from this?

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