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Question

Two bodies A and B each of mass m are fixed together by a massless spring A force  F acts on the mass B as shown in figure. At the instant shown, a body A has an aceclration a. what is the acceleration of B

  1. open parentheses F over m minus a close parentheses
  2. F-T
  3. open parentheses a minus F over m close parentheses
  4. a

The correct answer is: open parentheses F over m minus a close parentheses

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