Physics help

find the average acceleration (m/s^2)
The formula is a=v2-v1/change in time
I don’t understand how to solve this since I only have the average time and distance in (m) for the marble

Please explain using steps I’m really stuck

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asked by .
  1. what do you mean by "average time?"

  2. I had three times in seconds that I added then divided by 3 for the marble to come to a halt. I DONT KNOW HOW TO FIND THE AVERAGE ACCELERATION pLeAsE help this is due very soon

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