What is the minimum work that a motor must do to lift a 70 lb ...

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What is the minimum work that a motor must do to lift a 70 lb object from the floor to a height of 14 feet?
 a. 5 b. 70 c. 700 d. 980 e. 2010 ft-lbs

Question 2

A rock is thrown from the edge of the top of a 100-ft tall building at some unknown angle above the horizontal. The rock strikes the ground a horizontal distance of 160 ft from the base of the building 5.0 s after being thrown. Assume that the ground is level and that the side of the building is vertical. Determine the speed with which the rock was thrown.
 a. 72 ft/s
  b. 77 ft/s
  c. 68 ft/s
  d. 82 ft/s
  e. 87 ft/s

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Answer to Question 1

d

Answer to Question 2

C

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Gracias!

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