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The pulley in the diagram are all smooth...

The pulley in the diagram are all smooth and light. The acceleration of `A` is `a` upwards and the acceleration of `C` is `f` downwards. The acceleration of `B` is

A

`(1)/(2) (f-a)` up

B

`(1)/(2) (a+f)` down

C

`(1)/(2) (a+)` up

D

`(1)/(2) (a-f)` up

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