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A block of mass 1 kg is held at rest aga...

A block of mass 1 kg is held at rest against a rough vertical surface by pushing by a force F horizontally. The coefficient of friction is `0.5.` When

A

F = 40 N, friction on the block is 20 N.

B

F = 30 N, friction on the block is 10 N.

C

C = 20 N, friction on the block is 10 N.

D

Minimum value of force F to keep block at rest is 20 N.

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B, C, D
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