- #1

white_is

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## Homework Statement

A cannonball is fired with initial speed v0 at an angle 30° above the horizontal from a height of 38.4 m above the ground. The projectile strikes the ground with a speed of 1.3v0. Find v0. (Ignore any effects due to air resistance.)

## Homework Equations

v= Vo + at

v^2 = Vo^2 + 2a(x-Xo)

x = Xo + Vot + .5at^2

## The Attempt at a Solution

I honestly don't know where to start with this problem. I know it needs to be seperated into X and Y components, but it just seems like I don't have enough information to do it.

I mean, what do I know?

x = ?

Xo = 0

Vx = ?

Vox = ? Vcos30 = 1.3Vocos30

Vx = ?

a = 0

t = ?

y = -38.4

Yo = 0

Vy = ?

Voy = ? Vsin30 = 1.3Vosin30

Vy = ?

a = -9.8

t = ?

Can anyone help give me an idea of where to start?