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Q.

A conveyor belt is moving at a constant speed of 2 m/s. A box is gently dropped on it. The coefficient of friction between them is μ = 0.5. The distance that the box will move relative to belt before coming to rest on it taking g = 10 ms-2 is:

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a

0.6 m

b

zero

c

1.2 m

d

0.4 m

answer is D.

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Detailed Solution

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Force, F = μmg

Retardation of the block on the belt

a = Fm = μmgm = μg

From, v2 = u2+2as

          0 = (2)2-2(μg)s

       s = 42×0.5×10 = 0.4 m

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