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A balloon of gross weight w newton is falling vertically downward with a constant acceleration a(<g). The magnitude of the air resistance is :

1. w
2. a w 1 g       
3. a w 1 g       
4. a w g M m F=10N F=20N M 30° 30° m 1 m 2 PG #3

Correct answer: a w 1 g       

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