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particles of mass 3m and 5 m hang one at each end of a light inextensible string which passes over a pulley.The system is released from rest with the hanging parts taunt and vertical.During the subsequent motion the resultant force exerted by the string on the pulley is of magnitude-
a 8mg
b 7.5mg
c 3.75mg
d 4mg
e 2mg

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