Q.

In Figure, coefficient of kinetic friction between the 4 kg block and the inclined surface is 13 . Here 'm' is such a mass that the 4 kg block is moving up the plane with a constant speed, then m is:

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a

2 kg

b

2.8 kg

c

3.4 kg

d

4 kg

answer is D.

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Detailed Solution

Net force on system of two blocks = 0= mg = 4gsin 30° + μ(4gcos30°) = m = 4 kg
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In Figure, coefficient of kinetic friction between the 4 kg block and the inclined surface is 13 . Here 'm' is such a mass that the 4 kg block is moving up the plane with a constant speed, then m is: