ANSWERS: 2

See i need pen and paper and i have none now so i am just giving the way to solve. Its projectile motion. Take range =30 you have velocity and g value only you need to find out the angle theta. so put the angle in the height equation ad get the height.Simple. If you are not able to solve tell me.I am leaving due to shortage of time.Ill help you dont worry. I know without proper guidance physics can be absolute burden.

Can you please fill out how to get the answer completly.
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