1. The problem statement, all variables and given/known data A 900 kg car is parked on a hill when its brakes fail. It begins to roll down the hill, which is at a 15 degree angle above the horizontal. What is the car's speed after it has rolled 20m? Assum no friction. 2. Relevant equations F=ma v2=2aΔx 3. The attempt at a solution a=g(sin)(theta)-9.8(cos)(theta) a=2.54-9.47 a=6.93 v2=2aΔx v2=3(6.93)(20) v2=277.2 v=√277 v=16.6 m/s That looks right to me! Could someone please confirm?