Q. 41 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
(A) 0.69
(B) 0.88
(C) 0.98
(D) 1.37
Answer: (D)
Explanation:
