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A Racecar Driver Steps on the Gas,changing His Speed from 10

Question 136

Multiple Choice

A racecar driver steps on the gas,changing his speed from 10 m/s to 30 m/s in 4 seconds.The acceleration of the racecar is


A) 0
B) 2 m/s2.
C) 4 m/s2.
D) 5 m/s2.
E) 7.5 m/s2.

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