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A block R of mass 100 kg is placed on a block S of mass 150 kg as shown in the figure. Block R is tied to the wall by a massless and inextensible string PQ. If the coefficient of static friction for all surfaces is 0.4, the minimum of force F(in kN) needed to move the block S is


A
0.69
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B
0.88
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C
0.98
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D
1.37
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Solution

The correct option is D 1.37
Free body diagram of block R and S.

Free body diagram of block R and S.
FμN1+μN2

Fμ(N1+ N2)

Fμ(WR+WR+WS)

F0.4(100+100+150)×9.81

F1373.4N

F1.37kN

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