# Problem 6-7 Friction coefficient

A hockey puck travels $33\; m$ along an ice rink before coming to rest. Its initial speed was $11\;m/s$.

(a) What is the magnitude of the acceleration of the puck?
(b) What is the coefficient of kinetic friction between the puck and the ice?

Accumulated Solution

We start with a sketch of the problem and a choice of $+x$ to the right.

Which Galilean equation is useful for finding the acceleration with the information provided?

(A)   $v_x = v_{0x} + a_{x{^t}}$

(B)   $x = v_{0x{^ t}} + (1/2) a_xt^2$

(C)   $v_x{^2} = v_{0x}{^2} + 2a_xx$