The driver of a 1,000 kg car travelling at a speed of 16.7 m/s applies the car's brakes when he sees a red light. the car's brakes provide a frictional force of 8,000 n. determine the stopping distance of the car.

1.04 meters

Explanation:

Thinking process:

Gathering the data

mass  = 1 000 kg

speed, u = 16.7 m/s

Frictional force = 8 000 N

distance, s  = ?

final velocity  = 0 (car stops)

We know that the final velocity is calculated as:

But, a = negative (declaration)

And F = ma

substituting, 0 = (16.7) - 2 (8) (s)

                    -16.7 = -16s

                         s  = 1.04 m

   Stopping distance = 1.04 meters

d) the number of neutrons plus the number of protons