A body of mass m = 3.513 kg is moving along the x-axis with a speed of 500ms^–1. The magnitude of its momentum is recorded as

$\begin{array}{l}\mathrm{P}=\mathrm{mv};\mathrm{v}=5.00{\mathrm{ms}}^{-1}\\ \mathrm{m}=3.513\mathrm{kg};\mathrm{mv}=17.565\\ =17.6{\mathrm{gkms}}^{-1}\end{array}$
v has least significant figures three, so p should have three significant figures