A 65 kg bicyclist rides his 9.8 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?

A 65 kg bicyclist rides his 9.8 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 4.5 s to come to rest?What is the magnitude of the braking force?