Physics Review Question

Unit: Work and Energy
Year: 1993 Question#: 12
Question: A 0.10-kilogram ball dropped vertically from a height of 1.0 meter above the floor bounces back to a height of 0.80 meter. The mechanical energy lost by the ball as it bounces is approximately

(1 ) 0.080 J
(2 ) 0.20 J
(3 ) 0.30 J
(4 ) 0.478 J

What is this question really asking?




Explanation by: Jay D

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Answer 1
0.080 J

INCORRECT
The formula that you need to use is PE=mgh
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Answer 2
0.20 J

CORRECT

The formula that you need to use is PE=mgh PE=(0.10kg)(9.8m/s2)(0.20m) The mechanical energy lost is 0.20 J return to top



























Answer 3
0.30 J

INCORRECT

The formula that you need to use is PE=mgh return to top


























Answer 4
0.78 J

INCORRECT

The formula that you need to use is PE=mgh return to top


























What's this question really asking?
If a ball was dropped from a certain height how much mechanical energy was lost.
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