Answer on Mechanics | Relativity Question for aruj
N =& (m(2V)²/2) / (mV²/2) = (2V)² / V² = 4
times if its speed is doubled. So, the bullet will penetrate 4 times more planks, that is
M = 2*4 = 8
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It's ratio of kinetic energy of the bullet with velocity 2V to kinetic energy of the bullet with velocity V
What is 'N' in = 'N = (m(2V)²/2) / (mV²/2)'?