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Verified answer
Materi : Usaha dan EnergiSub bab : Energi
Diketahui :
v1 = v
v2 = 2v
Ditanya :
Ek2 = ?
Penyesaian :
Ek = ½mv²
2Ek = mv²
m = v²/2Ek
v1²/2Ek1 = v2²/2Ek2
v²/2Ek1 = (2v)²/2Ek2
v²/2Ek1 = 4v²/2Ek2 (kali silang)
2Ek2 v² = 2Ek1. 4v²
Ek2 = 4 Ek1
Jadi, besarnya energi kinetik berubah 4 kali semula
semoga membantu
-vin
Ek1/Ek2=v1²/v2²
Ek1/Ek2=v1²/(2v1)²
Ek1/Ek2=v1²/4v1²
Ek1/Ek2=4
Ek2=4Ek1