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## Homework Statement

Determine the initial velocity of a projectile that reuturns to launch level 10.0 seconds after it is launched and lands 300.0m away from the launch site.

## Homework Equations

Δx=v

_{0x}t

Δy=v

_{0y}t+1/2gt

^{2}

## The Attempt at a Solution

[/B] 300=v

_{0x}(10)

v

_{0x}=30m/s

I don't know how to procees with this problem since it appears that I'm missing v

_{0y}. I have time and the initial x component for velocity, but I don't know how I would use that to find the initial y component of velocity.

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