The average acceleration is the net velocity change divided by the time interval. For your first question, that would be 14.8 m/s divided by 15 s, which rounds off to 1.0 m/s^2.
For your second question, the answer is 32.6 m/s divided by 10 s.
A car accelerates at a constant rate from zero to 32.6 m/s in 10 seconds and then slows to 14.8 m/s in 5 seconds. What is its average acceleration to the nearest tenth of a m/s2 during the 15 seconds?
What was the acceleration during the first 10 seconds in the previous problem?
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