a certain car of mass 1400 kg gets 72 km per gallon (45 mpg) when cruising at a constant 25 m/s over level ground. the car’s engine/transmission is 35% efficient and runs on gasoline that has 110 mj energy per gallon. (a) find the power input in watts. (b) find the power output of the engine/transmission in watts and horsepower. (c) find the total amount of friction. (d) traveling at the same speed, find the number of km/gallon when climbing a slope of 4.0⁰ (assume friction does not change).