posted by Physicster on .
A 64 kg bicyclist rides his 7.7 kg bicycle with a speed of 13.5 m/s.
How much work must be done by the brakes to bring the bike and rider to a stop?
How far does the bicycle travel if it takes 4.5 s to come to rest?
What is the magnitude of the braking force?
I know the work in the first question is -6.43366 kJ but I have no idea how to find the distance and force.
average velocity= 13.5m/s * 1/2
force*distance= initial KE
solve for force.