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## Homework Statement

A 500kg car drives of a 400m cliff located on the surface of the earth how long does it take to hit the ground

## Homework Equations

F=ma

F=mg

d=1/d at^2

## The Attempt at a Solution

i first did f=mg to find f

then i did f=ma converted that to find a

then did 1/2 at^2 converted that 2

d x 0.5 / 9.8 then i root it to find t

but i got the wrong answer, the answer is 9 seconds can some one tell me what i did wrong

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