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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