- #1
sskk221
- 10
- 1
Homework Statement
A hockey Puck is hit and starts moving at 12m/s. Exactly 5 s later its speed is 6m/s. What is the coefficient of friction? How far has the pick traveled during the 5 s?
Homework Equations
[tex]\vec{F}_{net} = \Sigma \vec{F} = m \vec{a}[/tex]
[tex]f_k = \mu_k N[/tex]
The Attempt at a Solution
[tex]v = v_0 + a t[/tex]
[tex]6m/s = 12m/s + a 5s[/tex]
a= -1.2 m/s^2
[tex]x = x_0 + v_0 t + (1/2) a t^2[/tex]
[tex]x = 0m + 12*5s + (1/2) (-1.2m/s^2) 5^2[/tex]
x= 45m
Not sure how to precede. Answers are x =75m and coefficient of friction = 0.12. I apparently did the first part wrong