- #1

converse48

- 1

- 0

## Homework Statement

A stone is thrown vertically upward with a speed of 13.5 m/s from the edge of a cliff 74.0 m high

(a) How much later does it reach the bottom of the cliff?

(b) What is its speed just before hitting?

(c) What total distance did it travel?

## Homework Equations

i am only able to use these two equations

Δx=1/2at^2+Vo

Vo=initial velocity(i guess you guys already know that)

and

Vf(final velocity)=at+Vo

## The Attempt at a Solution

for c, first thing i did was get 1.38s by using the final velocity equation

and i put that and all the other data into the delta x equation

Δx=1/2(-9.8)(1.38^2)+13.5(1.38)

Δx=-4.9(1.90)+13.5(1.38)

Δx=9.32m

so i added that to 74 to get 83.32

BUT ITS WRONG!