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Byju's Answer
Standard VII
Physics
Work
The work done...
Question
The work done by a man in holding a
15
k
g
suitcase while waiting for a bus for
45
minutes is
A
675
J
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B
405
J
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C
450
J
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D
Zero
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Solution
The correct option is
D
Zero
Work=Force
×
displacement
Since displacement is zero,therefore work done is zero.
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Q.
In which of the following cases is the work done positive or zero or negative?
a) Work done by the porter on a suitcase in lifting it from the platform on to his head.
b) Work done by the force of gravity on suitcase as the suitcase falls from porter's head.
c) Work done by the porter standing on platform with suitcase on his head.
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