An auto moves 10 meters in the first second of travel, 15 more meters in the next second, and 20 more meters during the third second. The acceleration of the auto is
A. 5 m/s2.
B. zero m/s2.
C. 9.8 m/s2.
D. 3.33 m/s2.
E. 30 m/s2.
Answer: A
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