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How do you calculate the kinetic energy of a 3 kg toy cart that moves at 4 miles per second?
Wiki User
∙ 11y ago
4 miles per second = 6437.4 metres per second.
So kinetic energy = 0.5*3*6437.42 Joules = 62.16 mega Joules (approx).
I suspect the questioner actually meant 4 metres/second but has muddled two systems of dimensions that are not compatible anyway!
That would give a rather more probable 0.5 * 3 * 42 = 24 Joules.
Are we doing someone's homework again ....? Sometimes I think the better answer is to set any mixed-up units straight and just quote the formula! They'd learn more!
Wiki User
∙ 11y ago
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