1. The problem statement, all variables and given/known data A puck of mass 30 g slides across rough ice, experiencing a frictional force of 0.20N. If it was moving at 10km/h when it hit the ice patch, (a) how much time did it take to stop? (b) how long was the ice patch? Given: m=30g (0.03kg) Ff=0.20N V=10km/h (2.7m/s) 2. Relevant equations Fnet=ma a=v/t v=d/t 3. The attempt at a solution Fnet = ma a = Fnet/m a = 0.20N / 0.03kg a = 6.6m/s2 a = v/t t = v/a t = 2.7m/s / 6.6m/s2 t = 0.40s v = d/t d = vt d = (2.7m/s)(0.40s) d = 1.08m So therefore, it took 0.40s for the puck to stop. The ice patch was 1.08m.