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# Kinetic Energy

Energy is the currency of transformation. All systems remain the same unless energy is exchanged between one part and another. Learn here about the energy associated with movement.

A \(14\text{ kg}\) object initially at rest starts to fall freely. If air resistance is negligible, what is the object's kinetic energy after \(0.5\) seconds?

The gravitational acceleration is \(g=10\text{ m/s}^2.\)

What is the kinetic energy of a \(6\text{ kg}\) object moving at \(10\text{ m/s}?\)

A \(10\text{ kg}\) object, \(A\), travels at \(6\text{ m/s},\) and a \(6\text{ kg}\) object, \(B\), travels at \(10\text{ m/s}.\)

Find the ratio \(\text{K.E.}_A/\text{K.E.}_B\).

Recently, a meteor impacted Russia. The estimate of the meteor's size was \(10~\mbox{tons}\) and it was estimated to have entered the earth's atmosphere at a speed of \(14,600~\mbox{m/s}\). What was the total kinetic energy of such a meteor **in J** as it entered the atmosphere?

**Details and assumptions**

- One ton is \(907~\mbox{kg}\).

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