Một xe khởi hành từ A về B lúc 9h với vận tốc 36 km/h. 9h30p sau một xe từ B về A với vận tốc 54km/h. AB là đường thẳng. Khi 2 xe gặp nhau lúc 10h cách nhau 45km. a) tìm khoảng cách AB
b) 2 xe gặp nhau lúc mấy giờ và cách A bn km? chọn A làm gốc tọa độ, chiều dương
A->B, gốc thời gian 9h

The diagram shows four locations in the electric field of a positive point charge m. at which location is the electric potential the greatest.

Which is not an example of how an object gains elastic potential energy by stretching? a. jumping on a pogo stick b. pulling on a rubber band c. jumping on a trampoline

Isobars are lines of constant or equal pressure on a weather map. they can be used to find areas of low or high pressure over a broad area, and they can tell us how intense the system may be. on weather maps, you may have noticed areas that have a large l or h over a region with lines circling around them. the l stands for low pressure and h stands for high pressure. the lines circling them are isobars. check out the pressure system and isobars over georgia and florida. what is the present weather in this area ? a) clear and sunny b) cold and cloudy c) changing weather d) lots of precipitation