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**Quick question??**

## Homework Statement

this is not really a problem just was wondering,

does the following Kenimatics equation only work when the

force is a constant or can i work when the F is changing?

the equation is the one relating acceleration to velocity as follows

V(final)^2 = V(inital)^2 + 2*a*d

i know you can find a by using F=ma

i used this problem a earlier to find final velocity of an orbiting planet.

i used F to be equal to the graviational attraction between the two objects

the whole

G* m1*m2/r^2 thing.

but not sure if that would work or not.

if you know or have an opinion let me know

thanks