The pulleys 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

22-266

  • A

     $\frac{1} {2} (f-a) $up

  • B

    $\frac{1} {2}(a + f)$ down

  • C

    $\frac{1} {2}(a + f)$ up

  • D

    $\frac{1} {2}(a - f)$ up

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