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Mass and weight are often confused as we mistakenly use them interchangeably. If you recall ideas such as "how much will I weigh on the moon," what you are being reminded of is that your mass is unchanged but your weight is different because the force of gravity is different on the moon than on earth.
The equation for kinetic energy references "M" for mass. As mentioned earlier, converting weight to mass requires taking into consideration the force of gravity. So where you are when making that calculation makes a difference. The force of gravity differs slightly depending on where you are on earth as well. Gravity can be thought of as an artifact of the concentration of mass. So granite mountain ranges might be expected to have a slightly higher gravity than other places.
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