You testify as an expert witness in a case involving an accident in which car A slid into the rear of car B, which was stopped at a red light along a road headed down a hill (see the figure). You find that the slope of the hill is 0- 13.0, that the cars were separated by distance di -21.0 m when the driver of car A put the car into a slide (it lacked any automatic anti-brake-lock system), and that the speed of car A at the onset of braking was vo- 17.0 m/s. With what speed did car A hit car Bif the coefficient of kinetic friction was (a) 0.630 (dry road surface) and (b) 0.190 (road surface covered with wet leaves)? Units (a) Number Units (b) Number

You testify as an expert witness in a case involving an accident in which car A slid into the rear of car B, which was stopped at a red light along a road headed down a hill (see the figure). You find that the slope of the hill is 0- 13.0, that the cars were separated by distance di -21.0 m when the driver of car A put the car into a slide (it lacked any automatic anti-brake-lock system), and that the speed of car A at the onset of braking was vo- 17.0 m/s. With what speed did car A hit car Bif the coefficient of kinetic friction was (a) 0.630 (dry road surface) and (b) 0.190 (road surface covered with wet leaves)? Units (a) Number Units (b) Number