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Sally is driving along a straight highway in her classic 1965 Mustang. At time t = 0, she is moving at 10 m/s in the positive x-direction, when she passes a signpost that says "x = 50 m". Her acceleration as a function of time is
a = (2.0-.10)i
where a is measured in m/s^2, and t in seconds. At what time does she reverse directions?
 

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http://uotechnology(dot)edu(dot)iq/apps
ciences/physics/lecture/physics
/first_class/mechinical/3(dot)pdf


change the (dot) to . then go to page 13 i couldn't explain it any better
 
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