Question

A car slows down from 108 km/h to 90 km/h over the course of 4 s and 0.1 km. The force of the brakes was 1000 N. What is the work done by the brakes on the car?

Answer 1

d = 0.1km = 100 m.
Work = F*d = 1000*100 = ___ Joules.

Answer 2

So given that the answers are
a) none of the above
b) -4000 N
c) 4000 N
d) 110 000 N
e) -110 000N

it will be a?

Answer 3

Yes.