An airplane starts from rest and accelerate at a constant 3.00m/s^2 for 20.0 seconds what is its displacement in this time ?

It says acceleration is constant so velocity becomes zero.

Explanation:

S = 1/2* a * t^2

S = 1/2* 3 * 20^2

S=1/2*3*400

S=1/2*1200

S=600m

true

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