please answer this?

Question

a hockey player hits a puck with his stick giving the puck an initial speed of 5 m/s. if the puck slows uninformly and comes to rest in a distance of 20 m what is the coefficient of kinetic friction between ice and the puck??????

Answer 1

Look at a FBD of the puck

the forces are gravity in the vertical and friction in the horizontal

using conservation of energy
.5*m*v^2=f*d
v=5
f=m*g*uk
d=20
g=10
so
25/2=10*uk*20
uk=25/400

j