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Two identical uniform discs of mass m an...

Two identical uniform discs of mass `m` and radius `r` are arranged as shown in the figure. If `alpha` is the angular acceleration of the lower disc and `a_(cm)` is acceleration of centre of mass of the lower disc, then relation among `a_(cm), alpha` and `r` is

A

`alpha_(cm)=alpha//r`

B

`a_(cm)=2alpha//r`

C

`a_(cm)=alphar`

D

None of these

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