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A block of mass 2kg is held at rest agai...

A block of mass 2kg is held at rest against a rough vertical wall by passing a horizontal (normal) force of `45 N`. Coefficient of friction between wall and the block is equal to 0.5. Now a horizontal force of `15 N` (tangential to wall) is also applied on the block. Then the block will :

A

Move horizontally with acceleration of `5 m//s^(2)`

B

Start to move with an acceleration of magnitude `1.25 m//s^(2)`

C

Remain stationary

D

Start to move horizontally with acceleration greater than `5 m//s^(2)`

Text Solution

Verified by Experts

The correct Answer is:
b
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Knowledge Check

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

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    A
    2.5N
    B
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    C
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    D
    0.49N

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