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Air offers a retardation of `6m//s^(2)` to a particle. If it is projected vertically upwards with a speed of `96m//s` from ground then the time of flight is : `(g = 10 m//s^(2))`A. `19.2s`B. `12s`C. `18s`D. `24s` |
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Answer» Correct Answer - C Air offers ………… Maximum height `= (u^(2))/(2(g+a)) = (96xx96)/(2xx16) = 288m` Time of light `= sqrt((2H)/(g+a))+sqrt((2H)/(g-a))` `= sqrt((2xx288)/(16)) + sqrt((2xx288)/(4))` `= 6+12=18s` |
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