Problem you drop a rock from a height h the same moment, Ask an Expert

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Problem: You drop a rock from a height h the same moment your friend throws a rock upward at speed v. When the rocks collide, both rocks are moving at opposite directions, but the speed of the falling rock is twice that of the thrown rock.

Part A: What height, hcollide, did the collision occur?

I want you to clarify the physics in this above problem.

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