A bicycle coasts up a hill while a car drives up the hill. Which of the following statements is true?
1) The bicycle and the car both require external force to move up the hill.
2) The bicycle requires external force to move up the hill, but the car does not.
3) The car requires external force to move up the hill, but the bicycle does not.
4) Both the bicycle and the car do not require external force to move up the hill.