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
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
- 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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