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A force barF=hati+4hatj acts on block sh...

A force `barF=hati+4hatj` acts on block shown. The force of friction acting on the block is :

A

`-hat(i)`

B

`-18hat(i)`

C

`-2.4hat(i)`

D

`-3hat(i)`

Text Solution

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The correct Answer is:
A
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Knowledge Check

  • The friction acting on the upper block is

    A
    `8 N`
    B
    `2 N`
    C
    `25 N`
    D
    zero

  • A block of mass 5 kg is initially at rest on a rough horizontal surface. A force of 45 N acts over a distance of 2 m . The force of friction acting on the block is 25 N . The final kinetic energy of the block is

    A
    40 J
    B
    90 J
    C
    50 J
    D
    140 J

  • As shown in the figure , the friction force acting on the block is

    A
    `50 N`
    B
    `30 N`
    C
    `20 N`
    D
    None

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