a=s/t, and s=d/t, so if we substitute... a = (d/t)/t --> a = d/t2
You must know both the acceleration and time in order to solve for the distance travelled.
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acceleration times speed
Divide the distance traveled by the product of the diameter and pi.
You can't. You need either the final velocity or the acceleration of the object as well, and then you can substitute the known values into a kinematics equation to get the initial velocity.
You cannot. Force is mass times acceleration. You have neither.
Without distance, you have to know time, initial velocity, and acceleration, in order to find final velocity.