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Q.

If the elongation of spring is 4m then the minimum value of F for equilibrium is (g =10 ms2)
 

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a

60 N

b

200 N

c

80 N

d

120 N

answer is D.

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Detailed Solution

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Kx=T+f=2F+μmg50×4=2F+(0.4×10×10)

F=80 N
 

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