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Question

Calculate the tension in the string shown in figure. The pulley and the string are light and all surfaces are frictionless.  Take g = 10 m/s2.


Solution

T +1a = 1g                       ....(i)

and T = 1a                      ......(ii)

From equation (i) and (ii), we get

1a +1a = 1g

2a = g

a=g2=102=5m/s2

From equation (ii), T = 1a = 5N

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