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The distance S is affected by the car speed (call this V) when it hits the bottom of the ramp. V, in turn, is determined by the ramp height H, because as the car rolls down the ramp, the potential energy at the top (mgH) is converted to kinetic energy at the bottom (1/2 * mV^2). As H...

It sounds like you tried your best, but you really wanted to do better - tell them that, and they won't be disappointed at all. They might even help you do better on the next quiz, study with you, or hire a tutor. :)