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Q. The resistive force $F$ acting on a ball of radius $r$ moving with velocity $v$ is given by
$F=K r v$
The dimensional formula of $K$ is

Physical World, Units and Measurements

Solution:

As $F=K r v$
$[K]=\frac{[F]}{[r][v]}=\frac{ MLT ^{-2}}{ LLT ^{-1}}= ML ^{-1} T ^{-1}$