(a) How high (in m) a hill can a car coast up (engine disengaged) if friction is negligible and its initial speed is 74.0 km/h? (Enter a number.) 21.56 m (b) If, in actuality, a 750 kg car with an initial speed of 74.0 km/h is observed to coast up a hill to a height 10.0 m above its starting point, how much thermal energy (in ]) was generated by friction? (Enter a number.) 45,367.65 X J (c) What is the average force of friction (down the slope) if the hill has a slope 2.50 above the horizontal? (Enter your answer in N. Enter a number.) 28.059 X N