Dave is riding on a straight path. After 5 s, his speed is 3.0 m/s. After 7 s

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   Dave is riding on a straight path. After 5 s, his speed is 3.0 m/s. After 7 s, his speed is 5.0 m/s. After 10 s, his speed is 7.0 m/s. What was his acceleration from 5 s to 10 s? 
    

A. 0.67 m/s2
B. 2.0 m/s2
C. 1.0 m/s2
D. 0.8 m/s2