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Q.

A raft of wood (density 600 $k g / m^{3}$ ) of mass 120 kg floats in water. The weight that can be put on the raft to make it just sink is

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a

120 kg

b

200 kg

c

40 kg

d

80 kg

answer is D.

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Detailed Solution

$(m + 120) g = V d_{ω} g$

$m + 120 = \frac{120}{600} \times 1000 = 200$

m = 80 kg

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