a projectile has no velocity in the y-direction but has velocity in the x-direction?

[Sammy1024]

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I was wondering if someone could explain why.

 

[Cawolf]

That would occur at the peak height in the infinitely small period of time where the constant downwards acceleration switches the direction of travel, assuming it was launched with a positive initial y velocity.

The x velocity is constant assuming drag is negligible.

 

[Sammy1024]

Thank you!!!