Neglecting all types of friction, if two identical sleds, one empty and the other with four heavy passengers, start sliding down a hill together, the heavier sled will get to the bottom
1) before the empty car,
2) after the empty car,
3) at the same time as the empty car,
while in the presence of air resistance, the heavier car will get to the bottom
4) before the empty car.
5) after the empty car.
6) at the same time as the empty car.
Answer: 3, 4
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