Question

6. A 1500 kg car drifts along a level road and slows down from 35 m/s to 25 m/s in 20
seconds. What is the net force acting on the car? What is causing this force?

Answer 1

Answer:

750N

Explanation:

Newton’s Second Law of Motion in Terms of Momentum

The net external force equals the change in momentum of a system divided by the time over which it changes

$net force=\frac{momentum change}{time}\\ =\frac{m(V_(final)-V_(initial))}{time} \\=\frac{1500(35-25)}{20} \\=750 N$

change in velocity causes this force