liftoff speed

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At the top of a hill a car going at sufficiently high speed can lost contact with the road and lift off. We model the bill as a semi circle with radius 250 m and define the lift off speed as the speed for which the normal force between car and road is zero. If the car’s weight decreases from 1200 kg to 300 kg how does the lift off speed of the lighter car compare to the lift off speed of the heavier car? -the liftoff speed of the lighter car is 2/3 of that if the heavier car -the lift off speed of the lighter car is 1/4 of that of the heavier car -the liftoff speed stays the same -the liftoff speed of the lighter car is 1/2 of that of the heavier car
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