For the roller coaster shown below, a hydraulic catapultpropels the car to the t

Question

For the roller coaster shown below, a hydraulic catapultpropels the car to the top of the ride, at a height of 426 ft. If the car and occupants weigh1186 lb, what would be the potentialenergy of the loaded car at the top in joules?
J What is the potential energy of a 3.10 kg object at the bottom of a well11.6 m deep as measured from groundlevel?
J
Explain the sign of the answer.
2
For the roller coaster shown below, a hydraulic catapultpropels the car to the top of the ride, at a height of 426 ft. If the car and occupants weigh1186 lb, what would be the potentialenergy of the loaded car at the top in joules?
J What is the potential energy of a 3.10 kg object at the bottom of a well11.6 m deep as measured from groundlevel?
J
Explain the sign of the answer.
2

Explanation / Answer

You need to convert the obsolete units into international unitsfirst. The PE is given by mass * gravity * height gravity = 9.8 m/s2 convert 426 ft to metres (height) convert 1186 lb to kg then substitute. For the second part simply use m.g.h (no need to convert the unitsbecause they are in the international system) The sign is negative because energy needs to be put into the massto raise it against gravitational pull.

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