posted by Gracey .
A 70 kg bicyclist rides his 7.8 kg bicycle with a speed of 14 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 3.5 s to come to rest?
KE= work to be done
distance= averagevelocity*time= 1/2 starting velocity*time