A block A of mass m is placed over a pla...

A block A of mass m is placed over a plank B of mass 2m. Plank B is placed over a smooth horizontal surface. The coefficient of friction between A and B is `(1)/(2)` block A is given a velocity `v_(0)` towards right. Accelration of B relative to A is

`g/2`

`(3g)/(4)`

zero

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