Question

The brakes of a 1000-kg car exert 3000 N. (a) How long will it take the car to come to a stop from a velocity

of 30 m/s? (b) How far will the car travel during this time

Answer 1

The time is

$$t=v/a=vm/F=10\text{ s}.$$

The distance is

$$d=\frac{at^2}{2}=\frac{Ft^2}{2m}=150\text{ m}.$$