Physics-
General
Easy

Question

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

  1. ½ (f - a) up    
  2. ½ (a + f) down    
  3. ½ (a + f) up    
  4. ½ (a - f) up    

The correct answer is: ½ (f - a) up

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