SOLUTION:Step 1: List the given values.[tex]\begin{aligned} & m = \text{3 kg} \\ & h = \text{100 m} \end{aligned}[/tex]Step 2: Calculate the gravitational potential energy.[tex]\begin{aligned} GPE & = mgh \\ & = (\text{3 kg})(\text{9.8 m/s}^2)(\text{100 m}) \\ & = \boxed{\text{2,940 J}} \end{aligned}[/tex]Hence, the gravitational potential energy gained by the stone is 2,940 J.