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  • A man starts walking north at 6 ft/s from a point P.Five minutes later,a woman starts walking south at 4 ft/s from a poi

    A man starts walking north at 6 ft/s from a point P.Five minutes later,a woman starts walking south at 4 ft/s from a point 470 ft due east of P.At what rate ( in ft/s ) are the people moving apart 15 min after the woman starts walking?Please round your answer to the nearest hundredth
    英語人氣:902 ℃時(shí)間:2020-02-03 08:39:35
    優(yōu)質(zhì)解答
    題目要求女人出發(fā)15min中兩人相距距離增加的速率,只要求出兩人距離關(guān)于時(shí)間的函數(shù),然后求微分就可以求得.而兩人距離y^2=470^2+(6*5*60+6t+4t)^2即y=根號下(470^2+(1800+10t)^2),然后求微分,再把t=15*60=900代入,得到...
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