A ball rolling down an incline travels 6.0 cm in the first 0.25

A ball rolling down an incline travels 6.0 cm in the first 0.25 seconds, and 24 cm in the first 0.50 seconds. Find: 

  1. a)  The average speed for the first quarter second time interval 

  2. b)  The average speed for the second quarter second time interval. 

  3. c)  Find its acceleration.

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