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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+ f ) `up

D

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

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