Lab Experiment - Puck Impact on Wall, Analyzing Force

[iris]

Homework Statement

I have solved up until the value of impulse and the final value I have to acquire is time of collision to then solve for average force. In this system their is a puck that is slid across a frictionless plane, and after every 30 ms (milliseconds) makes a carbon dot on a piece of paper. The puck hits a wall and experiences a loss of momentum and redirects its path. I have had trouble figuring out how to find how long the collision took.

Relevant Equations

AvgF= impulse/collision time

Please see attached image. This was a lab performed where a puck hit a wall shown on the page, the difficulty I’ve had is being able to see when and for how long the puck hit the wall as it is needed to find the average force in the system. Each dot on the page is 30milliseconds apart.

 

[haruspex]

Seems clear that the collision time is a lot shorter than 30ms, so I see no way to find it from these data.
Please post the complete statement of the task as given to you.