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use  the acceleration of gravity (g)

and suvat

hope that helped.

See Jonas' solution for the correct way to solve the problem, where we consider the energy transfer from gravitational potential energy to kinetic energy. Just to show the algebra:

gravitational potential energy = mgh, kinetic energy = ½mv²

mgh = ½mv²

m cancels from both sides:   gh = ½v²

rearrange to find the speed v:   2gh = v²   ⇒   v = √(2gh)

Wow, thank you so much explaining this to me!

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