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Hkm kekekalan momentum
mx.Vx + my.Vy = mx.Vx' + my. Vy'
0 + 0 = 3 Vx' + 5 Vy'
-3Vx' = 5 Vy'
Vx' = -5/3 Vy'
Ek= 1/2mv²
Ek ~ m
Ek ~ v²
Ek x' : Ek y' = mx.Vx'² : my.Vy'²
= 3. (-5/3 Vy')² : 5.Vy'²
= 3. 25/9 Vy'² : 5 Vy'²
=3. 25/9 : 5
= 25/3 : 5
= 25 : 15
= 5 : 3