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`W_(1),W_(2)` and `W_(3)` are the different sizes of windows `1, 2,` and `3` respectively placed in a vertical plane. A particle is thrown up in the vertical plane. Let `t_(1),t_(2)` and `t_(3)` are the time taken to cross the window `W_(1), W_(2)` and `W_(3)` respectively and `DeltaV_(1), DeltaV_(2)` and `DeltaV_(3)` are the change in speed after respective window cross. A. Average speed of the particle passing the windows may be equal if `W_(1)ltW_(2)ltW_(3)`B. Average speed of the particle passing the windows may be equal if `W_(1)gtW_(2)gtW_(3)`C. If `W_(1)=W_(2)=WP_(3)`, the change in speed of the particle while crossing the windows will satisfy `DeltaV_(1)ltDeltaV_(2)ltDeltaV_(3)`D. If `W_(1)=W_(2)=W_(3)`, the time taken by particle to cross the windows will satisfy `t_(1)lt t_(2) lt t_(3)` |
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Answer» Correct Answer - A::C::D As going up, speed of the particle is decreasing and hence the time taken in crossing the windows will be `t_(1)lt t_(2) lt t_(3)` (if `W_(1)=W_(2)=W_(3)`) Simultaneously `DeltaVpropt` `:.DeltaV_(1)ltDeltaV_(2)lt DeltaV_(3)` For unequal windows `t_(1)=t_(2)=t_(3)` may be if `W_(3)ltW_(2)ltW_(1)` |
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