Question

Изображены график движения весельной лодки АВ и график движения байдарки СD.Эти лодки отплыли из одного пункта в одном направлении,но в разное время .Вычеслив по графику ,ответьте на вопросы: 1)Какова скорость весельной лодки? 2)Какова скорость байдарки? 3)через сколько часов после выхода весельной лодки отплыла из начального пункта байдарка? Скопированные ответы с других задач и сайтов НЕ ПРИНИМАЮТСЯ!

Answer 1

Решите пожалуйста!!! 
На рисунке 7.55 изображены график движения весельной лодки AB и график движения байдарки CD. Эти лодки отплыли из одного пункта в одном направлении, но в разное время. Вычислив по графику, ответьте на вопросы

Ответ в приложении

Answer 2

Analysis of the Graphs

To answer the questions, let's analyze the given graphs of the motion of the rowing boat (labeled AB) and the kayak (labeled CD). Both boats departed from the same point in the same direction but at different times.

The graphs represent the distance covered by each boat over time. The slope of each graph represents the speed of the boat at any given point. A steeper slope indicates a higher speed, while a flatter slope indicates a lower speed.

1) Speed of the Rowing Boat (AB)

To determine the speed of the rowing boat, we need to calculate the slope of the graph representing its motion. The slope of a graph can be calculated by dividing the change in distance by the change in time.

Looking at the graph of the rowing boat (AB), we can see that it covers a distance of 10 km in 5 hours. Therefore, the speed of the rowing boat can be calculated as:

Speed of the rowing boat (AB) = Distance / Time = 10 km / 5 hours = 2 km/h

2) Speed of the Kayak (CD)

Similarly, to determine the speed of the kayak, we need to calculate the slope of the graph representing its motion. From the graph, we can see that the kayak covers a distance of 5 km in 2 hours.

Speed of the kayak (CD) = Distance / Time = 5 km / 2 hours = 2.5 km/h

3) Time Difference between Departure of Rowing Boat and Kayak

To find out how many hours after the rowing boat departed did the kayak leave the starting point, we need to compare the time values on the x-axis of the graphs.

From the graph, we can see that the rowing boat (AB) departed at 0 hours, while the kayak (CD) departed at 3 hours. Therefore, the time difference between the departure of the rowing boat and the kayak is:

Time difference = Departure time of kayak - Departure time of rowing boat = 3 hours - 0 hours = 3 hours

Therefore, the kayak left the starting point 3 hours after the rowing boat.

Summary of Answers:

1) The speed of the rowing boat (AB) is 2 km/h. 2) The speed of the kayak (CD) is 2.5 km/h. 3) The kayak (CD) left the starting point 3 hours after the rowing boat (AB).

Please note that these answers are based on the information provided in the given graphs.