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Q.

A person holds a block weighing 2kg between his hands & keeps it from falling down by pressing it with his hands. If the force exerted by each hand horizontally is 50N, the co-efficient of friction between the hand & the
block is (g=10ms–2)

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a

0.1

b

0.2

c

0.5

d

0.4

answer is A.

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Detailed Solution

The weight is balanced by the frictional force on both hands,

2f=mg⇒2μN=mg⇒μ=202x50=0.2

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