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In the figure shown, upper block is give...

In the figure shown, upper block is given a velocity of `6 m//s` and lower block. `3 m//s`. When relative motion between them is stopped

A

Work done by friction on upper block is `-10 J`

B

Work done by friction on lower block `+10 J`

C

Net work done by friction is zero

D

All of the above

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The correct Answer is:
A
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