Physics

A rocket of mass,m is located at an alttitude h meters above the surface of a planet of a mass,M and radius, R.
*write an expression for the gravitational pull on it.
*Deduce an expression for the gravitational potential and escape velocity at that location.

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  1. F = G m M/r^2 = G m M/(R+h)^2
    potential = - G m M /(R+h)
    (1/2) m v^2 = G m M/(R+h)
    so
    v^2 = 2 G M/(R+h)

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