A boy holds a 40N weight at arm’s length for 10s. His arm is 1.5m above the ground, the work done by the boy on the weight while holding it is… [Take g=10 m/s^2]

Zero

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6.1J

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40J

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90J

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Solution

The correct option is A
Zero

Step 1: Given data:
Weight, F=40N
Time, t=10s
Height from the ground, h=10m
Step 2: Formula
The work done by the boy is
W=F.s
Where F is the force and s is the displacement.
Here s=0m. Therefore,
W=(40N) (0m)
W=0J
Hence, correct option is A.

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