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Question

In the figure, a force F=20 N is applied on block A. What would be the acceleration of the block B after 10 seconds from the start. Assume all surfaces are smooth.

 
  1. 106 m/s2
  2. zero
  3. cannot be calculated
  4. 2 m/s2


Solution

The correct option is B zero
Since the contact force between A and B is the normal reaction which is vertical, no horizontal force acts on B. Hence its aB=0.

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