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If a ball is thrown with a velocity of 3.0m/s at an angle of 30 degrees...

If a ball is thrown with a velocity of 3.0m/s at an angle of 30 degrees below horizontal. When is its vertical velocity zero?
a) At the max height
b) just before it hits the ground
c) when it changes direction
d) never during its flight
d) never during its flight
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