how would I solve: A$)$ A $142\mathrm{.}5$ kg football player runs towards the ball at a speed of $2\mathrm{.}75$m$/$s$.$ What is the football player's momentum?$$

B$)$At what rate would a $93\mathrm{.}5$ kg player have to run, in order to have the same momentum as the player in part A$?$