- #1

CannonSLX

- 40

- 0

## Homework Statement

Object falls from a tree which is 3m above the ground, what is its velocity when it hits the ground ?

## Homework Equations

mgΔh=1/2mv

^{2}

or

s=vt-1/2at

^{2}

## The Attempt at a Solution

Using the idea of PE=KE, as the masses cancel out I get an answer of V=7.66ms

^{-1}

However I thought that this question can also be done with a suvat equation, I use the same condition which is used for KE [That U=0].

When attempting with suvat I get an answer of 17.15ms

^{-1}why is that ?