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## Homework Statement

A space shuttle weighing 7.3 x 10^8 kg takes off from Cape Canaveral. If the air resistance is 1.2 x 10^5 N and the thrust is 8.9 x 10^11 N, how long will it take the shuttle to reach a velocity of 4500 m/s?

## Homework Equations

at + vi = vf

ƩFy=mg

ƩFx=ma

## The Attempt at a Solution

I know I have to subtract Fg and Ff (or are they the same thing?) from Fa (or N? normal force?) and set that equal to mass x gravity. Is gravity just -9.8m/s/s? And then I have to put that into at + vi = vf (acc. x time + initialvelocity = finalvelocity) but I'm just really lost.