You haven't mentioned the speed difference or speed gain in this question so it cannot be answered
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acceleration = change in velocity divided by timeaccel = (9-3)/3 = 6/3 = 2 meters per second per second
If the ball started off stationary and the acceleration is the same for the 2 seconds, then the acceleration of the ball is:Speed / time = acceleration9 (m/s) / 2 (s) = 4.5 (m/s/s)Hope this helps.
9 Years = 284012568 Seconds
9 hours, 25 minutes, 59 seconds = 33,959 seconds.
60 seconds = 1 minute. 60 x 9 = 540 seconds.