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Assuming all the surfaces to be frictionless, acceleration of the block C shown in the figure is

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a
5 m/s2 Upwards
b
3.5  m/s2downwards
c
3.5 m/s2 upwards
d
5 m/s2 downwards

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detailed solution

Correct option is C

According to work – energy theorem

TxATxB+2TxC=0 2aC=aA+aB aC=4+32 aC=3.5 m/s2 upwards

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