In the given picture both string & pulley are massless, pulley and surface are frictionless. Find the tension in the string.

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Solution

The correct option is B

Acceleration of both blocks will be same. Lets assume it to be a. lets draw Free Body Diagram.

5mg cos $53^{\circ}$ + T = 5ma --------------(i)

mg - T = ma -----------------(ii)

solving (i) & (ii)

We get T = $\frac{m g}{3}$

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