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A jumbo jet needs to reach a speed of 300 km/hr on a runway for take off. Assuming a constant acceleration and a runway 2 km long, what minimum acceleration from rest is required to get the jet in the air?

2. Homework Equations

I tried using the equation:

2a(X-Xo)=V^2+Vo^2

But there is also:

X=Xo+Vot+(1/2)at^2

V=Vo+at

3. The Attempt at a Solution

I set up the following variable list:

Xo=1.5 Vo=?

X=21.5 V=0

t=? a=-9.8

I plugged these values into the equations mentioned above to get a final answer of 2250km/hr^2 for the acceleration needed. Would this be correct?