v = 0 = 81 - 5 t
800 = 81 t - 5.2 t^2
use that same stopping time t
A jet plane lands with a speed of 81 m/s and can accelerate at a maximum rate of −5.00 m/s2 as it comes to rest.
(a) From the instant the plane touches the runway, what is the minimum time needed before it can come to rest?
(b) Can this plane land on a small tropical island airport where the runway is 0.800 km long?
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