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With reference to the figure shown, if the coefficient of friction at all the surfaces is 0.42, then the force required to pull out the 6.0 kg block with an acceleration of 1.50 m/s2 will be:

(A) 36 N  (B) 24 N (C) 84 N (D) 51 N 

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Correct option (D) 51 N 


F – 8(0.42) (10) – 2(0.42) (10) 

= 6 (1.5) F – 42 

= 9 F

= 51 N

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