A girl swims in a100mt long pool. She covers 60m with velocity 20m/s and covers  the rest of distance with velocity 10m/s calculate  average velocity of girl 

Asked by Sudhanshu Shridhar | 30th May, 2015, 03:31: AM

Expert Answer:

begin mathsize 12px style Total space distance space travelled space is space 100 space straight m. Time space taken space to space travel space the space to space travel space 60 space straight m space with space velocity space 20 space straight m divided by straight s straight t subscript 1 equals 60 over 20 equals 3 space straight s Time space taken space to space travel space the space to space travel space 40 space straight m space with space velocity space 10 space straight m divided by straight s straight t subscript 2 equals 40 over 20 equals 2 space straight s Average space velocity equals fraction numerator displacement over denominator straight t subscript 1 plus straight t subscript 2 end fraction equals fraction numerator 100 over denominator 3 plus 2 end fraction equals 50 space straight m divided by straight s The space average space velocity space of space girl space is space 50 space straight m divided by straight s end style

Answered by Priyanka Kumbhar | 1st Jun, 2015, 11:55: AM

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