Using conservation of energy and assuming the car is at rest at the top of hill, that means that all of its energy is in the form of potential energy. The formula for potential energy is
U = mgh,
where m is mass in kg,
g = 9.81 m/s^2,
and h is the height in meters
U = (840)(9.81)(18) = 148,327.2 J
This is the total energy in the system, and since there is no potential energy at the bottom of the hill since at that point h = 0, then that means all the energy was converted to kinetic energy (assuming no energy was lost).
Therefore, the answer is 148,327.2 J
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