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Ep1 + Ek1 = Ep2 + Ek2
2 . 8 . 10 + 0 = 0 + Ek2
Ek2 = 160 Joule
B.
Ep1 + Ek1 = Ep2 + Ek2
2 . 8 . 10 + 0 = 0 + 1/2 . 2 v²
160 = v²
v = 4√10 m/s