It depends on what the initial velocity was. If it was 0, then:
11-0 = 2.2 m/s squared
5
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The average rate of acceleration is (11/5) = 2.2 m/sec2 .
80 m/s2 up
The average acceleration during any interval is (change in speed) divided by (time for the change).A = (25 - 10)/5 = 15/5 = 3 meters per second2
80 m/s 2 up
Average acceleration during a time interval = (change in speed) divided by (time for the change) =(25) / (5) = 5 meters per second2