Physics-
General
Easy

Question

A body floats in a liquid contained in a beaker. The whole system as shown falls freely under gravity. The up thrust on the body due to the liquid is

  1. Zero    
  2. Equal to the weight of the liquid displaced    
  3. Equal to the weight of the body in air    
  4. Equal to the weight of the immersed position of the body    

The correct answer is: Zero


    Upthrust equals V rho subscript text liquid end text end subscript left parenthesis g minus a right parenthesis
    where, a = downward acceleration,
    V = volume of liquid displaced
    But for free fall a = g therefore Upthrust = 0

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