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Q.

In the diagram shown, the 2kg block is acted upon by a horizontal force P and the block is sliding down the rough vertical wall with constant velocity of 1m/s. If coefficient of friction between the block and the wall is 13, The total reaction of the wall on the block is

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a

80 N

b

50 N

c

60 N

d

40 N

answer is D.

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Detailed Solution

N = p and f=μN=μPAlso, f - mg = 0  ⇒ f = mg∴p=fμ=mgμ∴Total reaction, R=f2+N2=mg2+mgμ2⇒R=mg1+1μ2=2 x 10 x 1+32=40 N
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In the diagram shown, the 2kg block is acted upon by a horizontal force P and the block is sliding down the rough vertical wall with constant velocity of 1m/s. If coefficient of friction between the block and the wall is 13, The total reaction of the wall on the block is