Angelina Jolie

How to find the coefficient of friction of golf ball-surface?

We set up a lab like this :

We have a golf ball and a whiffle ball, and three separate surfaces. Using a laser pointer and a light sensor, we were able to find the initial velocity by calculating the speed at which the ball blocked the laser from the sensor traveling along the surface. We calculated the distance it when along the surface as well.

Example – Golf Ball (.0459 kg and 1.5 in diameter) along putting green surface

Initial Velocity : 29.45738 in/sec

Duration: 0.0508927 sec

Distance: 16 in.

We were given these equations
Total Kinetic Energy = Translational + Rotational = ½ mv^2 + ½ I w^2

Rotational frequency: w= v/R

For sphere: I = 2/5 m R^2

Substitute eqns 2 & 3 into eqn 1:
(initial velocity)
KE i = 7/10 m v i 2

When object stops: (final)

KEf = W S f = (mg) S f

Combine eqns 4 & 5 to get:
f = 7 v i 2 / 10*g*S

Where:
v i = ft/s
S = ft
g= 32.2 ft / s2

Im not good with this stuff, so please help me out.