A1400 kg car is approaching the hill shown in (figure 1) at 11 m/s when it suddenly runs out of gas. neglect any friction.

If I use the conservation of energy laws without considering thermal energy it seems like a simple energy conservation question, but I am given a diagram (shown below) that gives angles. I wouldn't need the angles unless I wanted to calculate the vertical distance for thermal friction, but I'm not given a coefficient for rolling friction..

The answer would be a) -80of