A driver applies the brakes on his car reducing its speed from 31.0 m/s to 11.0 m/s in a time 5.0 secs while traveling a distance of 121 m. What is the magnitude of the car's average acceleration during the 5.0 sec period ? [A] 8.4 m/s² [B] 8.4 m/s [C] 24.2 m/s [D] 4.0 m/s²
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