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## Homework Statement

A ball is thrown downward from a tower 65.0 m tall. If the ball takes 1.30 seconds to hit the ground, what was its initial velocity?

The answer my teacher provides is 43.6 m/s, but I am having a problem reaching that answer.

## Homework Equations

Possibly Vi = Vf - aT? This is the equation I am trying to use, but the final velocity is not given, I don't think.

## The Attempt at a Solution

First, I tried Vi = 0 + 9.8 x 1.3, but obviously, it doesn't work. So whether there is information missing or I am using the wrong formula, I don't know. Any help would be appreciated!