A crane at a junkyard lifts a car with a mass of 2000 kg at a constant speed to a height of 30 m. It then turns and drops the car into a car crusher on the ground below. a) Determine the maximum gravitational potential energy of the car. b) Determine the maximum speed of the car as it falls to the ground. c) Determine the force exerted by the crane in lifting the car to its maximum height.

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Chapter8: Conservation Of Energy
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7. A crane at a junkyard lifts a car with a mass of 2000 kg at a constant speed to a height of 30 m. It
then turns and drops the car into a car crusher on the ground below.
a)
Determine the maximum gravitational potential energy of the car.
b)
Determine the maximum speed of the car as it falls to the ground.
c) Determine the force exerted by the crane in lifting the car to its maximum height.
Transcribed Image Text:7. A crane at a junkyard lifts a car with a mass of 2000 kg at a constant speed to a height of 30 m. It then turns and drops the car into a car crusher on the ground below. a) Determine the maximum gravitational potential energy of the car. b) Determine the maximum speed of the car as it falls to the ground. c) Determine the force exerted by the crane in lifting the car to its maximum height.
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