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Masses M1, M2 and M3 are connected by st...

Masses `M_1`, `M_2` and `M_3` are connected by strings of negligible mass which pass over massless and friction less pulleys `P_1` and `P_2` as shown in fig The masses move such that the portion of the string between `P_1` and `P_2` in parallel to the inclined plane and the portion of the string between `P_2` and `M_3` is horizontal. The masses `M_2` and `M_3` are 4.0kg each and the coefficient of kinetic friction between the masses and the surfaces is 0.25. The inclined plane makes an angle of `37^@` with the horizontal.

If the mass `M_1` moves downwards with a uniform velocity, find
(i) the mass of `M_1`
(ii) The tension in the horizontal portion of the string `(g=9.8 m//sec^2, sin 37^@=3//5)`

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