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Consider a damped oscillation due to air...

Consider a damped oscillation due to air resistance. It is given that air resistance is directly proportional to velocity but in opposite direction. It us found that amplitude reduces to half in` 20` oscillations. Whaat eill be amplitude when it completes` 80 `oscillations? (Initially amplitude is `15` cm)

A

`1/15` cm

B

`15/16` cm

C

`1/16` cm

D

`15/8` cm

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