7. A 5000kg elevator starts from rest accelerates uniformly to a constant speed of 2.0m/s and decelerates uniformly to stop 15m above its initial position. Neglecting friction and other losses, what work was done on the elevator?
7. A 5000kg elevator starts from rest accelerates uniformly to a constant speed of 2.0m/s and decelerates uniformly to stop 15m above its initial position. Neglecting friction and other losses, what work was done on the elevator?
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Transcribed Image Text:7. A 5000kg elevator starts from rest accelerates uniformly to a constant speed of 2.0m/s and
decelerates uniformly to stop 15m above its initial position. Neglecting friction and other losses,
what work was done on the elevator?
8.
A body weighing 3500lbs (force) fall 1 ft and strikes a 2000lbs per inch spring. What is the
deformation on the spring in ft?
9.
If it requires 10.0 J of work to stretch a particular spring by 20 mm from its equilibrium length,
how much more work will be required to stretch it an additional 9.0 cm?
Work and Energy
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