Velocity is measured in metres per second, to find how many metres a body has travelled you need t know the length of time it was moving for.
If a body moves at 10 metres per second for 5 seconds, how far does it travel?
It goes 10 metres every second, so in 5 seconds it must go 5 times 10 metres; 50 metres.
You need to multiply the velocity by the time taken. (m/s) X s = m.
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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.
Decrease ..
Divide the distance traveled by the product of the diameter and pi.
Without distance, you have to know time, initial velocity, and acceleration, in order to find final velocity.
You can't. The mass is irrelevant to velocity. You need the distance.