A hockey puck slides with an initial speed of 52.3 m/s on a large frozen lake. If the coefficient of kinetic friction between the puck and the ice is 0.02, what is the speed of the puck after 11.8 s?

Answer 1

vf=vi+at

but a=- force/mass=-mu*mg/m=-mu*g

the negative sign indicates oposite direction to movement
solve for Vf