Final answer:
The skier's gravitational potential energy at the highest point of flight is 3847.92 Joules.
Step-by-step explanation:
The skier's gravitational potential energy at the highest point of flight can be calculated using the equation:
Gravitational Potential Energy = mass × gravitational acceleration × height
Given that the skier's mass is 84 kg, the gravitational acceleration is 9.8 m/s², and the height is 4.7 m, we can calculate the gravitational potential energy:
Gravitational Potential Energy = 84 kg × 9.8 m/s² × 4.7 m
Gravitational Potential Energy = 3847.92 J
Therefore, the skier's gravitational potential energy at the highest point of flight is 3847.92 Joules.