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ek1 = 4 joule
ek2 = 9 joule
v1 = 6m/s
dit v2?
ek1 = 1/2 . m . v²
ek2 = 1/2 . m . v²
4 = 1/2 . m . 6²
9 = 1/2 . m . x²
=
4x² = 324
x² = 81
s = 9
jadi kecepatan benda q : 9 m/s