Question

A ball is thrown horizontally at a velocity of 12.9 m/s. What is its downward velocity after 7.9 seconds?

Answer 1

help me

Answer 2

downward velocity = velocity on the y axis.
So you plug the data you're given into the y axis velocity formula:
\[v_{fy}=v_{iy}+a_y \times t\]
vfy = final velocity on y axis (which is what you're looking for)
viy = initial velocity on y axis (hinted, but given)
ay = acceleration (9.81)
t = time (given)