You are riding a \(450-\mathrm{kg}\) horse at \(14.4 \mathrm{~km} / \mathrm{h}\) cast along a desert road. You have inertia equal to \(60.0 \mathrm{~kg}\). A police officer driving past (whom you know and who knows your inertia and the horse's inertia) measures your speed relative to the police car and calculates your kinetic energy to be \(16.32 \mathrm{~kJ}\). What possible speed(s) could the police car have been driving at the instant the officer measured your speed?