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The initial velocity is zero.

In most basic physics problems like this one the initial velocity will be zero

as a rule of thumb:

the initial velocity is always zero, unless otherwise stated, or this is what you are solving for

Cases where the initial velocity is not zero

examples

a cannon ball is shot out of a cannon at 50 mph

a ball is thrown from at a speed of 15 mph

etc

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Q: If a small marble is dropped straight downward what is the initial velocity of the marble?
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