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Q.

A block of mass 10 kg is placed on a horizontal table. A string tied to it passes over a frictionless pulley and carries a hanging body at the other end. The coefficient of kinetic friction between the block and the table is 0.3. What should be the mass ‘m’ of hanging body so that the system may move with uniform speed?

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a

10 kg

b

3.33 kg

c

3/10 kg

d

3 kg

answer is B.

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Detailed Solution

$μ m_{1} g = m_{2} g$
$0.3 \times 10 = m_{2}$
$m_{2} = 3 k g$

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