- #1
rokr32
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Homework Statement
The driver applies the brakes and the car comes to rest in 15m. Calculate the average braking force exerted on the car in coming to rest.
The average resistive force acting on the car is 2.4 x 103N
Homework Equations
F=ma
SUVAT maybe?
The Attempt at a Solution
When using KE = 1/2mv2, the problem is easy to solve. However, I'm not allowed to use this. Therefore, I have NO IDEA how to solve this.
One approach I took is, given that the average resistive force is 2400N, I did:
15F + 2400 = 0
F = -160N.
Then, given that the signs are irrelevant, I can add 160N to 2400N and get 2560N which rounds to 2.6 x 103N.
By the way, the answer should be 2.6 x 103N
Thanks :D