Answer: So, the correct answer is a loss of potential energy, indicated by the negative sign.
Explanation: We can use the formula for potential energy:
ΔPE = m × g × Δh
where: ΔPE = change in potential energy m = mass of Vinko (we'll assume a typical adult male mass of around 70 kg) g = acceleration due to gravity (approximately 9.8 m/s²) Δh = change in height
From the problem, we know that Vinko descended 55 meters down the slope and then another 11 meters down the ski hill. So, the total change in height is:
Δh = -55 m - 11 m = -66 m
The negative sign indicates a decrease in height, which means a loss of potential energy.
Now, let's plug in the values:
ΔPE = 70 kg × 9.8 m/s² × -66 m = -45,516 J
The change in potential energy is approximately -45,516 Joules, which represents a loss of potential energy as Vinko descends the hill.