Question 1184740
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The general formula is


    u = g*t,


where u is the velocity of the body freely falling (in meters per second), t is the time in seconds, g is the gravity acceleration g = 9.81 m/s^2.


For example, for t = 2 seconds (one of the examples from list)


    u = 9.81*2 = 19.62 m/s.


For other cases, use the formula and make calculations  ON  YOUR  OWN  by the same way,  as instructed.
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Solved, answered and explained.