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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 force F (in $kN$) needed to move the block S is .

  1. $0.69$
  2. $0.88$
  3. $0.98$
  4. $1.37$
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