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The magnitude of acceleration of blocks ...

The magnitude of acceleration of blocks of mass 2kg and 4 kg are `a_1` and `a_2` respectively. ( pulley and strings are massless and g = 10 m/`s^2` the relation between `a_1` and `a_2` is
A) `a_1=2a_2`
B)`2a_1=a_2`
C) `a_1=4a_2`
D) `a_1=a_2`

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