A car starts from rest at a stop sign. It accelerates at 4.0 {\rm m/s^2} for 7.5 s,...

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...coasts for 2.2 s, and then? A car starts from rest at a stop sign. It accelerates at 4.0 {\rm m/s^2} for 7.5 s, coasts for 2.2 s, and then slows down at a rate of 3.3 {\rm m/s^2} for the next stop sign.
How far apart are the stop signs?
 
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