A body of mass $m=3.513\text{kg}$ is moving along the $x$ -axis with a speed of $5.00\text{m/s}$. The magnitude of its momentum is recorded as:

Momentum $p=m\times v=3.513\times 5.00=17.565\text{kg m/s}$.According to the rules of significant figures, the result of multiplication should have the same number of significant figures as the least precise measurement.$3.513$ has 4 sig figs.$5.00$ has 3 sig figs.The result should be rounded to 3 sig figs: $17.565\to 17.6\text{kg m/s}$.