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A bock of mass 0.5 kg is pulled by 12 N ...

A bock of mass 0.5 kg is pulled by 12 N force on a fixed block. Speed of block is constant. Find total contact force applied by lower block on upper block.

A

`12 N`

B

`5 N`

C

`13 N`

D

`17 N`

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The correct Answer is:
C
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