- #1

Julia Smith

## Homework Statement

A rock that is thrown upward from a bridge with an initial velocity of 2.0 m/s. (Assume there is no air drag: a = -10m/s

^{2}).

a) If the rock takes 4.0 s to hit the water below once the rock is released. What is the final velocity of the rock as it hits the water?

b) How high is the bridge?

## Homework Equations

v = u +at

x = x

_{0}+ v

_{i}t + 1/2*a*t

^{2}

## The Attempt at a Solution

For (a), I know that the equation I can use is v = u + at.

*u*being initial velocity.

*v = (2.0m/s) + (-10m/s*

v = -38 m/s

^{2}) (4.0s)v = -38 m/s

However, for (b), I do not know how I can solve it and need help on that ASAP