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