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19. Mr. Watkins warms up by walking 100 meters at 0.5 m/s, and then runs 100 meters at 9.3 m/s.
What isthe runner's average speed? [t=d/s] [Speed=total distance/time]
A. 0.95 m/s
B.0.34 m
C. 0.9 s
D. 0.72 m/s



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