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OpenStudy (anonymous):
A light plane must reach a speed of 124.1 km/hr for takeoff. How long a runway is needed if the (constant) acceleration is 2.1 m/s^2 and it starts from rest?
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OpenStudy (anonymous):
Assuming no wind, you can use\[v_f^2= 0v_i^2+2as\] Of course if you're a pilot, they give you the answer in the manual for the plane. :)
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