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A balloon of weight w is falling vertica...

A balloon of weight w is falling vertically downward with a constant acceleration `a(gt g)`. The magnitude of the air resistance is

A

w

B

`w(1+(a)/(g))`

C

`w(1-(a)/(g))`

D

`w(a)/(g)`

Text Solution

Verified by Experts

The correct Answer is:
C
( c) Suppose air resistance is F (upwards), then from equation of motion of balloon, we have
F=mass`xx`acceleration`=(W)/(g).a`
`therefore " " F=W(1-(a)/(g))`
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