Physics-magnitude of braking force?

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Physics-magnitude of braking force?

A(n) 1406.8kg car is coasting along a level road at 22.9m/s. A constant braking force is applied, such that the car is stopped in a distance of 58.4m.
What is the magnitude of the braking force? Answer in units of N.

2006-10-24 20:43:47 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Physics

2 answers

it moves at a certain speed when the brake is applied
thereofre all the kinetic energy must be consumed by a certain force at a certain distance.

therefore. 1/2 m*u^2 = F*s

therefore

F= m*u^2 / 2s =
6316.27Nt.

its direction is opposite to the movement of the car

2006-10-24 20:56:18 · answer #1 · answered by Emmanuel P 3 · 0⤊ 0⤋

The problem is about kinetic energy converted to work energy. I agree with the solution of the first answerer.
Regards.

2006-10-25 04:06:39 · answer #2 · answered by tul b 3 · 0⤊ 0⤋