A body floats in a liquid contained in a beaker. The whole system as shown in Figure falls freely under gravity. The upthrust on the body is

Options

A. Zero
B. Equal to the weight of the liquid displaced
C. Equal to the weight of the body in air
D. Equal to the weight of the immersed portion of the body

Answer

A

Explanation

The whole system falls freely under gravity. Upthrust = weight of fluid displaced = (mass of fluid displaced) `xxg_(eff)` for a freely falling body, `g_(eff)=0`. Therefore upthrust=0