A bag of sand originally weighing 144 lb was lifted at a constant rate. As it rose, sand also leaked out at a

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A bag of sand originally weighing 144 lb was lifted at a constant rate. As it rose, sand also leaked out at a

[From: ] [author: ] [Date: 12-09-11] [Hit: ]

Answer in ft-lb.Thank you!-Im going to say that the work done is the average weight of the bag * distance.The distance is easy 16ft.The weight of the bag at the end was 72lb.The work done then is 108lb * 16ft = 1728 ft-lb.......

A bag of sand originally weighing 144 lb was lifted at a constant rate. As it rose, sand also leaked out at a constant rate. The sand was half gone by the time the bag had been lifted to 16 ft. How much work was done lifting the sand this far? (Neglect the weight of the bag and lifting equipment.)
Answer in ft-lb.
Thank you!

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I'm going to say that the work done is the average weight of the bag * distance.

The distance is easy 16ft.

The weight of the bag to begin with was 144lb
The weight of the bag at the end was 72lb.
The average weight of the bag then is (144+72)/2 = 108 lb

The work done then is 108lb * 16ft = 1728 ft-lb.

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