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EM1 = EM2
EK1 + EP1 = EK2 + EP2
0 + mgh1 = 1/2 m + mgh2
gh1 = 1/2 + gh2
gh1 - gh2 = 1/2
10.10 - 10.5 = 1/2
50 = 1/2
100 =
v = 10 m/s