At what velocity does the stone impact? (Link to picture included)

[mitochondria3]

I have no clue how to do this problem, so if someone could explain to me step by step, it would be greatly appreciated!


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[temaire]

Can you please repaste the image?

 

[temaire]

 

[temaire]

Nvm, I did it.

 

[temaire]

It's against forum rules to help someone if they haven't shown any work. So can you at least start my writing down some relevant equations that you might have learned in class?