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Minimum force required to keep a block o...

Minimum force required to keep a block of mass 1 kg at rest against a rough vertical wall is P. If a force `P//2` is applied then the acceleration of the block will be :

A

`5 m//s^(2)`

B

`2.5 m//s^(2)`

C

`2 m//s^(2)`

D

`0.9 m//s^(2)`

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The correct Answer is:
A
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