Physics

Problem

A student measures the mass of a ball as

(2.50 \pm 0.05)\,\text{kg}

and its speed as

(4.0 \pm 0.2)\,\text{m}\,\text{s}^{-1}

. She wants to find the momentum

p = mv

. Explain, without doing any calculation, which measurement contributes more to the uncertainty in

p

and give the reason.