$\mathrm{}$ A snooker player is making an attempt at potting the black ball. To do this they first hit the white ball with the cue, horizontally and exactly in line with its centre such that the impact from the cue imparts no rotational acceleration to the ball. The white ball then moves across the table and collides with the black ball at some angle. Each ball has a radius $R=2\mathrm{.}63cm$ and a mass $m=140g.$ The coefficient of kinetic friction between ball and table, ${}_k=0\mathrm{.}05.$ 

$$$$ Once the snooker player has hit the white ball, it begins to decelerate due to the friction between the ball and the table. Using Newton's $2$nd Law, calculate the initial linear deceleration of the white ball due to the  

frictional force.