HELP!!

[Dolores Keeley]

#5 takes a long time to set up, and it does not give directions for finding the ball's launch speed, or the club's speed.... However, it is really cool to see how the mass of the club effects the distance the golf ball travels, and the distance the club "bounces" back.
Questions for you physics experts:
  Is there a term for the club "bounce back" distance? My students are calling it "ricochet distance".
  How do you find the launch speed with this set up... there were no stop watches in this kit!
  In terms of the challenge goals- is just concluding the effects of mass of club to distance traveled good enough?

Suggestions for this this lab:
  Have each group set up one test... and then rotate around the room... getting the string on and the balls hung takes too long for each group to do!  Also, take the mass of each, and compare the ratios, like they've been doing in Act 2 and 3.

[Sushma Sharma]

We called club's bounce back distance  "recoil of club".Ideal way to find the launch speed  is by using photogates however rough estimate can be calculated by using meter scale and and stopwatch also one can compare the  launch speed by keeping the launch distance constant and let gravity do the rest.( we used the stopwatch provided in earlier kit). 
Set up time can be reduced by providing  strings of the same size and placing  two clamps on the same stand .
Sushma