Question: You want to give a third-grader a common example that illustrates how much energy a joule is. Show that a 0. 1(mathrm{kg}) ring of keys

You want to give a third-grader a common example that illustrates how much energy a joule is. Show that a 0. 1$\mathrm{kg}$ ring of keys falling out of your pocket develops about $1 \mathrm{~J}$ of kinetic energy before hitting the ground. Can you think of another example?

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