Buxoro davlat universiteti




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2.1.4-masala.Uzunligi 400 m bo`lgan poyezd,uzunligi 500 m bo`lgan tuneldan 30 sekuntda o`tib ketdi.Poyezdning tezligini toping?

A)35 m/s B)30m/s C)40m/s D)45m/s E)25m/s



Yechish:Bu masalada poyezning umumiy bosib o`t gan yo`liga e`tiborni qaratish kerak,chunki poyezd uzunligi 500 metr bo`lgan tuneldan butunlay chiqib ketishi uchun poyezd o`zining uzunligicha masofani ya`ni, 400metr masofani bosib otishi kerak.Demak poyezdning umumiy bosib o`tgan yo`li 500+400=900 metr ga teng, poyezd bu yo`lni 30sek da bosib o`tgan.Demak poyezdning tezligi

V==30 m/s Javob:B





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