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If a ladder weighing $250 \mathrm{~N}$ is placed against a smooth vertical wall having coefficient of friction between it and floor is 0.3 , then what is the maximum force of friction available at the point of contact between the ladder and the floor
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$75 \mathrm{~N}$
$F=\mu R=0.3 \times 250=75 \mathrm{~N}$
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