To move in the jet pack with constant velocity or to hover, What needs to be true?
1) The thrust force generated by the jet pack must be equal to the weight of the person
2) The thrust force generated by the jet pack must be greater than the weight of the person
3) The thrust force generated by the jet pack must be less than the weight of the person
4) The thrust force generated by the jet pack is not related to the weight of the person
