khi 1 ô tô đang chạy với vận tốc 15m/s trên 1 đoạn đường thẳng tù ng lái xe hãm phanh cho ô tô chạy chậm dần đều. sau khi chạy thêm được 125m thì vận tốc của ô tô chỉ còn bằng 10m/s. tính gia tốc của ô tô. tính khoảng thời gian để ô tô chạy trên quãng đường 125m đó

Suppose water is leaking from a tank through a circular hole of area ah at its bottom. when water leaks through a hole, friction and contraction of the stream near the hole reduce the volume of water leaving the tank per second to cah 2gh , where c (0 < c < 1) is an empirical constant. a tank in the form of a right-circular cone standing on end, vertex down, is leaking water through a circular hole in its bottom. (assume the removed apex of the cone is of negligible height and volume.) (a) suppose the tank is 20 feet high and has radius 8 feet and the circular hole has radius 2 inches. the differential equation governing the height h in feet of water leaking from a tank after t seconds is dh dt = − 5 6h3/2 . if the height of the water is initially 8 feet, how long will it take the tank to empty? (round your answer to two decimal places.)