two identical blocks of weight w are placed one on top of the other as shown in figure the upper block is tied to the wall the lower block is pulled to the right with a force f the coefficient of static friction between all surfaces in contact with μ what is the largest force f that can be exerted before the lower block starts to slip
a) μW
b) 2μW
c) 3μW
d) 4μW
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it will be the 2nd option
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