You cannot. You must have distance (or displacement).
If you know it is from a standing start then accelaration will do.
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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.
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.
Use the formula Acceleration = (final velosity - initial velocity)/ time.
If you have an initial and final velocity and time you can figure it out with this equation, Vf squared=Vi squared1/2a(t squared) If you don't have those you cannot find acceleration. However the acceleration on Earth is a constant -9.81