Depends on the cannon and the charge.
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Its initial speed cannot be 20 m, as stated in the question. Secondly, if the initial speed is correctly given, then there is no need to calculate it!
Yes.
The speed will depend on its initial velocity and any forces acting on it.
they would be in a vacuum
If you know the initial speed (u), acceleration (a) and time (t), then the final speed, v = u + at.