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.
The Attempt at a Solution
I don't know how to procees with this problem since it appears that I'm missing v0y. 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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