Physics
posted by HELP .
A 6110kg bus traveling at 20.0 m/s can be stopped in 24.0 s by gently applying the brakes. If the
driver slams on the brakes, the bus stops in 3.90 s. What is the average force exerted on the bus in both
these stops?

Please note that no one here will do your work for you. However, we will be happy to read over what YOU THINK and make suggestions and/or corrections.
Please post what you think. 
(Avg. force)*(time) = (momentum change)
= M * Vo
Solve for the average force.
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