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Ec=1/2(0,4)(30)²
Ec=180
ep=o
15m....
Ep=mgh
Ep=0,4x9,8x15
Ep=58,8
2gh=v2²-v1²
2x-9,8x15 +30²=v2²
v2²=606
Ec=1/2x0,4x606
Ec=121,8