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Homework Statement
In space two banelings are separated by a distance of 1x10^10. Baneling-A has 5 solar mass and a radius of 2.5 billion meters. Baneling-B has 1 solar mass with a radius of 1.5 billion. They are initially at rest from each other. Measured at a rest frame, (a)how fast are they moving when their separation is half of the initial value? (b)What is d(speed)/d(separation)?
Homework Equations
(1/2) (M) (vf)^2 - (GMm/distace final) = (1/2) ( M) (vi)^2 - (GMm/distace inital)
The Attempt at a Solution
(1/2) (1x10^31) (Vf^2) - ((6.67x10^-11) (1x10^31) (2x10^30)) / (1x10^10/2) =
(0) - ((6.67x10^-11) (1x10^31) (2x10^30)) / (1x10^10)
vf= 163340
is it right? did i use the right mass? do i need to convert solar mass to kgs?