A 6110-kg bus traveling at 20.0 m/s can be stopped in 24.0 s by gently applying the brakes. What is the average force exerted on the bus in this stop?

Question

I can't figure this one out

Answer 1

(Momentum change)= impulse
= (Force) x (time)

Force = M V/(time)

Answer 2

6110 * 20 whole thing divided by 24 = 5.09*10^3N