Serway Problem $27\mathrm{.}37-$ the uncertainty principle:

An electron and a $0\mathrm{.}0200-$kg bullet each have a velocity of magnitude $5\mathrm{.}00{10}^2\frac{m}{s},$ accurate to within $0\mathrm{.}0100\%.$ Within what lower limit could we determine the position of each object along the direction of the velocity?

Answer:

Within $1\mathrm{.}16$ mm for the electron, $5\mathrm{.}28{10}^{-32}m$ for the bullet