Step-by-step explanation:
The kinetic energy (\(KE\)) of an object can be calculated using the formula:
\[ KE = \frac{1}{2} \times \text{mass} \times \text{velocity}^2 \]
Given that the mass of the cars and people is \(8040 \, \text{kg}\), and assuming this mass is the total mass of the rollercoaster, you can substitute this value into the formula along with the velocity to find the kinetic energy at the top of the hill.
If you have the velocity (\(v\)), you can calculate \(KE\) using the formula above. Please provide the velocity to proceed with the calculation.