Physics
posted by Jennifer .
A hobby rocket reaches a height of 72.3 m and lands 111 m from the launch point.What is the angle of launch?
What is the launch speed?

I don't think it can be worked, without knowing how long the engine burns. The rocket is not a projectile until the fuel burns out. The launch speed is easy, it starts at zero veloicty, the rocket burns and it is accelerated upward.

The answers is 69 degrees. I don't know why
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