When atmospheric resistance is taken into account for the projectile, the time of flight compared to that without atmospheric resistance is

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less

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remains the same

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can't say

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Solution

The correct option is C can't say
Time of flight will depend only upon the vertical forces since that only decided the time required to cover the height. Now, if the projectile goes up, then the air resistance contributes to reducing the time of flight while it contributes to increasing time of flight when the projectile comes down. Hence exact statement can't be made regarding this.

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