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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