- #1

cybernerd

- 27

- 0

## Homework Statement

A 500g rock is thrown straight down from a bridge and hits the water 5.2 m below. If the rock strikes the water at a speed of 12.5 m/s, what was the initial speed of the rock?

## Homework Equations

I'm not totally sure...

## The Attempt at a Solution

I have no idea how to even start this. Could someone help me start to solve it, please?