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m.g.h + 1/2 m.v^2 = m.g.h + Ek2
5.10.20 + 1/2.5.0 = 5.10.5 + Ek2
1000 + 0 = 250 + Ek2
Ek2 = 1000 - 250
Ek2 = 750 J