Question

a car(m=2000 kg) has an initial speed of 40 m/s and the driver applies the brakes over a distance of 200 m until the car stops, what is the average force required to stop the car over the 200 m

Answer 1

Find the average acceleration:
\[v _{f}^{2}=v _{i ^{2}}+2ad\] then
F=ma

Answer 2

F = ma
vo^2 = 2ad

Answer 3

thanks!!

Answer 4

Noe
a is negative

Answer 5

That's right, and should be understood by the student.