1. The problem statement, all variables and given/known data Starting from a rest position, how long will it take a 50 kg cyclist riding a 10 kg bike to reach a speed of 4 m/s if the resultant force acting on the bicycle is 48 N? 2. Relevant equations F=ma Vf=Vi + at 3. The attempt at a solution F=ma (F-48)=(50+10)(a) At this point I have to unknowns and one apparent equation.