- #1
Sky.Anthony
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Homework Statement
A 58 kg person is in a head-on collision. The car's speed at impact is 13 m/s. Estimate the net force on the person if he or she is wearing a seat belt and if the air bag deploys.
For some reason, I can't seem to get the correct answer to this question... I have no idea where I am going wrong. According to the question, if a person is wearing a seatbelt, they deaccelerate over a distance of 1m.
Homework Equations
(Final Velocity)^2 = (Initial Velocity)^2 + 2*acceleration*distance
Force=mass*acceleration
The Attempt at a Solution
First off, I had to find the deacceleration over the distance of 1m:
(Final Velocity)^2 = (Initial Velocity)^2 + 2*acceleration*distance
0 = (13m/s)^2 + 2*acceleration*1m
acceleration= -84.5m/s^2
Using that acceleration to calculate net force...
F=ma
= (58kg)(-84.5m/s^2)
=-4901N
I put that answer into the system and it comes back wrong...
Help is appreciated. Thanks!