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Two masses $M_1$ and $M_2$ are attached to end of a string which passes over a pulley attached to the top of a double inclined plane. If $M_1$ and $M_2$ are $5 kg$ each. and the base angles are $30^{\circ}$ each. The tension in the string.

$(a)\;20\;N \quad (b)\; 25\;N \quad (c)\; 50\;N \quad (d)\;100\;N$

Tension $T=mg \sin \theta$
$\qquad=50 \times \large\frac{1}{2}$
$\qquad=25 \;N$
Hence b is the correct answer.

edited Jan 26, 2014 by meena.p