a child riding a bicycle at 15 meters per second decelerates at the rate of...

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...3.0 meters per second squared for? a child riding a bicycle at 15 meters per second decelerates at the rate of 3.0 meters per second squared for 4.0 seconds. What is rhe child's speed at the end of 4.0 seconds?
A. 12 m/s
B. 27 m/s
C. 3 m/s
D. 7 m/s
 
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