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Q.

A block of weight 20 N is pressed against a vertical wall as shown in figure by applying a horizontal force of the block  (g=10ms−2)  if μk=0.4  then  The least horizontal force required to keep the block in equilibrium is

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a

40 N

b

20 N

c

50 N

d

10 N

answer is D.

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Detailed Solution

F=μsN

mg=μsN

mgμs=N⇒N=200.4=50

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