An airplane is flying at a constant speed in a positive direction. It slows down when it approaches the airport where it's going
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From the equation you can tell that your particle is moving with a costant acceleration. The generic movement equation is , and velocity is given by
with
and
being the position and velocity at
s.
By comparing the two acceleration is costant, and it's the same at t=0, t=3.0, or t=3000s, and is . Velocity comes from the second formula, you found the acceleration in the previous step, and you just have to plug 0 for
, the value of a you found, and 6 s for t.