[Answer] 5. A race car speeds up after rounding a turn, from 15 m/s at 30 seconds into the race, up

5. A race car speeds up after rounding a turn, from 15 m/s at 30 seconds into the race, up to 60 m/s at 40
seconds into the race.
15 m/s
60 m/s
30 s
40 s
Determine the race car’s average acceleration during this time interval.

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