Answers

2014-07-13T13:20:22+05:30
Gravitational force acts on the bag. That does not bring in change of motion because it is in connection with you and you are already in contact to the ground.
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Pleaseb
Sorry that was wrong but please pick it as the best
2014-07-13T15:00:15+05:30

gravitational force is the reason but the air resistance or friction produced by air is also a reason.
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