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=mg
hreturn to top
Answer 2
0.20 J
CORRECT
The formula that you need to use is
PE=mg
h
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=mg
h
return to top Answer 4
0.78 J
INCORRECT
The formula that you need to use is
PE=mg
h
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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