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**If problem states "acceleration is constant" what is the acceleration?**

While gliding down a steep hill, a bike rider experiences constant acceleration. After 4.50 seconds, he reaches a final velocity of 7.50 m/sec. The bike's displacement was 19.0 meters.

I know that I'm supposed to be using one of the kinematics equations. But what do I put as acceleration when it says constant acceleration? What does variable a equal to?

t=4.5

vf=7.5 m/s

d= 19m

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