An airplane travels 500m down the runway before taking off it starts from rest , moves with constant acceleration and becomes airborne after 20.0s. What is the speed when it takes off?
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Expert's answer
2018-09-13T12:12:08-0400
s=1/2 at^2 ⇨ =a=2s/t^2 . Substitute a for 2s/t^2 below: v=√2as=√(2·2s/t^2 ·s)=2s/t=(2·500)/20=50 m/s.
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