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1) (a) How high (in m) a hill can a car coast up (engine disengaged) if friction is negligible and its initial speed is 80

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1) (a) How high (in m) a hill can a car coast up (engine disengaged) if friction is negligible and its initial speed is 80.0 km/h? 

_________m

(b.) If, in actuality, a 750 kg car with an initial speed of 80.0 km/h is observed to coast up a hill to a height 11.0 m above its starting point, how much thermal energy (in J) was generated by friction? ________J

(c) What is the average force of friction (down the slope) if the hill has a slope 2.5° above the horizontal? 

________N

2. A 71.6-kg boy is surfing and catches a wave which gives him an initial speed of 1.60 m/s. He then drops through a height of 1.59 m, and ends with a speed of 8.51 m/s. How much nonconservative work (in kJ) was done on the boy?
_________kJ