SOLUTION:
Step 1: List the given values.
[tex]\begin{aligned} & m = \text{50 kg} \\ & g = \text{9.8 m/s}^2 \\ & h = \text{250 m} \end{aligned}[/tex]
Step 2: Calculate the potential energy.
[tex]\begin{aligned} PE & = mgh \\ & = (\text{50 kg})(\text{9.8 m/s}^2)(\text{250 m}) \\ & = \boxed{\text{122,500 J}} \end{aligned}[/tex]
Hence, the potential energy of a 50-kg boulder is 122,500 J.
[tex]\\[/tex]
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