find the tension T needed to hold cart in equilibrium , if there is no friction

The net horizontal forces must be balanced, since tendency of motion is in horizontal direction. Assume the tension in string to be T1. Then T1 = Wsin30= W/2. Now the horizontal component of this force must be equal to tension T. Therefore, T1cos30=T. Hence, T = root3W /4

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searching for the same question...someone help
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aakash?
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