I think I have the answer! But I'm not sure because I don't know potential energy and kinetic energy very much.

For the first question,

m = 225 g = 0.225 kg

g = 9.82 m/s

d = 300 m

potential energy = m x g x d = 0.225 x 9.82 x 300 = 662.85 j

For the second question,

It's the same result because when it hits the ground : potential energy = kinetic energy.

Thank you for your cooperation

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