Respostas

2014-05-26T09:11:10-03:00
0,5kg=500g
Ec=[mv^2]\2
Ec=[500(10)^2]
Ec=500(100)\2
Ec=50000\2
Ec=25000

Ee=kx^2\2
25000=800x^2\2
x^2=2(25000)\800
x^2=62,5
x=raiz62,5
x=7,9metros

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