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Question

If a ladder weighing 250N is placed against a smooth vertical wall having a coefficient of friction between it and floor 0.3, then what is the maximum force of friction available at the point of contact between the ladder and the floor?

A
75N
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B
50N
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C
35N
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D
25N
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Solution

The correct option is A 75N
Maximum frictional force acting on the ladder is when the ladder stands straight on the ground.
Thus N=mg=250N
Thus the frictional force is μN=0.3×250N=75N

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