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  4. A solid sphere falls with a terminal velocity of 20 m/s in air. If it is allowed to fall in vacuum?

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Q. A solid sphere falls with a terminal velocity of $20\, m/s$ in air. If it is allowed to fall in vacuum?

AMUAMU 2015Mechanical Properties of Fluids

Solution:

As in vacuum, there is no viscosity, no resistive force and hence no terminal velocity can be acquired.