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.The coefficient of rolling friction is 0.1. What is the car's speed after it has rolled 20m? 2. Relevant equations F=ma v2=2aΔx 3. The attempt at a solution a=9.8(sin15)-0.1(9.8)(cos15) v2=2.54-0.947 v=1.6 m/s Looks good to me! Is it right? Thanks!