1. The problem statement, all variables and given/known data suppose the rlller coaster in the figure passes point 1 with a speed of 1.70m/s. If the average force of friction is equal to 1/5th of its weight, with what speed will it reach point 2? the distance traveled is 45m. 2. Relevant equations conserv. of E and Work 3. The attempt at a solution - i dont know how to do it.