A student and his bicycle have a mass of 50 kg and the student is riding at 8 m/s. If the student comes to a stop in 30 m, how much braking force did her use?

Two objects of different mass start from rest, are pulled by the same magnitude net force, and are moved through the same distance. the work done on object 1 is 900 j. after the force has pulled each object, object 1 moves twice as fast as object 2. how much work is done on object 2?