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Please help me to understand this question of the problem:

A boy wants to knock down a coconut with a rock and his slingshot. He observes that the coconut is about 3.0m above his slingshot and the tree is 4.0m away along the ground.

He knows from experience that the release speed of his rock is 20m/s.

**How far above the coconut should he aim?**

I don't understand what I am asking to do here. Please can someone help me?

brad