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## Homework Statement

a ball is thrown horizontally from a height of 16.01m and hits the groung with a speed that is 5.0 times its initial speed. what was the initial speed?

## Homework Equations

## The Attempt at a Solution

dx=?

vx=?

t=?

dy= -16.01m (because the ball is falling that distance)

viy= vi

vfy= 5vi

a= -9.8 m/s^2

vf^2= vi^2 + 2ad

(5vi)^2= vi^2+ 2(-9.8)(-16.01)

25 (vi^2)= vi^2+ 313.8

what should i do next if this is right?