. A firetruck travelling at a speed of 30.0 m/s encounters an emergency and comes to a complete stop. How much time will it take for the car to stop if it decelerates at -4.0 m/s^2?
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Explanation:
V = Vo + at
0 m/s = 30 m/s + (-4.0 m/s2) (t)
-30 m/s = (-4.0 m/s2) (t)
(-30 m/s) / (-4.0 m/s2) = t
t = 7.5 s
The (-) sign is for magnitude, speeding up or slowing down.
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