Well, we'll measure the amount of energy after the collision, compare it to the amount of energy before, and if there's less energy after the collision than before, this will be evidence that the energy has drifted away.
Pa, izmjerit ćemo količinu energije nakon sudara, usporediti je s količinom prije, i ako nakon sudara energije bude manje nego prije to će biti dokaz da je energija nekamo otišla.