What Quantities Are Zero for an Object Launched Parallel to the Ground?

[unknownplaya]

Hello. I have a question on this problem.
What are two quantities of an object launched parallel to the ground which are equal to zero?

I think one of the two is vertical velocity, but I'm not sure.

please help me with this problem. Thank you.

 

[berkeman]

Hello. I have a question on this problem.
What are two quantities of an object launched parallel to the ground which are equal to zero?

I think one of the two is vertical velocity, but I'm not sure.

please help me with this problem. Thank you.

Welcome to the PF. You are correct that the initial vertical velocity is zero. What could the second quantity be? I'm guessing that you are to neglect air resistance in this problem?