Type your question here An 850 kg automobile is travelling at 114.5 km/hr on a l

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An 850 kg automobile is travelling at 114.5 km/hr on a level road in a region where the acceleration of gravity is 9.812 m/s2. It follows the road up a hill to a level area at the top where it is subsequently parked. The top of the hill is 31.0 m above the level portion of the road. What is the change in potential energy of the car (in kJ) between the initial and final position? (Use a positive value for an increase in energy and a negative value for a decrease in energy.)

Explanation / Answer

Change in potential energy =

m g ( h - h o)

= m g h

h o = 0 on level ground

PE = 850 * 9.812 * 31

= 258546.2 J

= 258.5462 kJ

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