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Verified answer
E = 1/2 . m . v²E1 = E2
½ mv² = ½ mv²
½ m 10² = ½ m 20²
½ m . 100 = ½ m . 400
100 = 400
1 = 4
Jadi, perbandingan energi kinetiknya 1:4 (D)