$$U=mgh$$

The gravitational potential energy of an object can be calculated using the formula above, where $U$ is the potential energy of an object in joules, $m$ is the mass of the object in kilograms, $g$ is the gravitational constant in meters per second squared, and $h$ is the object's height in meters. On earth, the gravitational constant is approximately $10 \frac{m}{s^2}$. Which of the following is closest to 100 joules?

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$$U=mgh$$

We are given a few quantities. We want to find when the potential energy of the object is 100 joules. On earth, $g=10$. $$100 = m \cdot 10 \cdot h$$ $$10=m \cdot h$$ We simply need to find the answer choice where $m\cdot h = 10$. Only one answer is suitable.