# Find how long does it take to hit the ground from a car off a cliff

## 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

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

Last edited:

You're looking for an answer in metres, how far something is, is distance.

So the answer can't be 9 seconds. You already have how long it was in the air.

NascentOxygen
Staff Emeritus
A 500kg car drives off a cliff at 50km/h how far would it land from the base of the cliff if it was in the air for 10 seconds

## Homework Equations

F=ma
F=mg
d=1/d at^2
You are interested in its travel in the horizontal. The car experiences no acceleration horizontally.

You're looking for an answer in metres, how far something is, is distance.

So the answer can't be 9 seconds. You already have how long it was in the air.

i been studying all night and its rly late i was combining 2 questions in 1 cuz i am soo tired i fixed the question now lol

NascentOxygen
Staff Emeritus