Question

из одной норы одновременно в разных направлениях побежали две мыши.когда одна из них пробежала 4м со скоростью 20см/с,расстояние между ними стало 7 м.найди скорость второй мыши.

Answer 1

В 1 метре 100 см

4 метра=400 см

7 метров =700 см

1) 400 :20=20 секунд время 

2) 700:20=35 см/сек скорость удаления двух мышей

3) 35- 20 =15 см/сек скорость 2 мыши

Answer 2

Чтобы узнать скорость надо разделить путь на время   V=S:t, время t = S:V

1 м = 100 см

1) 7 - 4 = 3 м пробежала 2я мышь.

2) 400 : 20 = 20 сек - время события

3) 300 : 20 = 15 см/сек  - скорость 2й мыши

Answer 3

Problem Analysis

We are given that two mice start running in opposite directions from the same hole. One of the mice runs a distance of 4m with a speed of 20cm/s. After this, the distance between the two mice becomes 7m. We need to find the speed of the second mouse.

Solution

Let's assume that the speed of the second mouse is v cm/s.

We know that the distance covered by the first mouse is 4m and its speed is 20cm/s. Therefore, we can calculate the time taken by the first mouse using the formula:

Time = Distance / Speed

Substituting the values, we have:

Time taken by the first mouse = 4m / 20cm/s = 20s

Now, let's consider the time taken by the second mouse to cover the distance of 7m. Since the two mice are running in opposite directions, the total distance covered by both mice is the sum of their individual distances.

Therefore, the total distance covered by both mice is 4m + 7m = 11m.

We can calculate the time taken by the second mouse using the formula:

Time = Distance / Speed

Substituting the values, we have:

Time taken by the second mouse = 11m / v cm/s

Since both mice start running at the same time, the time taken by the first mouse is equal to the time taken by the second mouse. Therefore, we can equate the two expressions for time:

20s = 11m / v cm/s

To find the speed of the second mouse, we can rearrange the equation:

v cm/s = 11m / 20s

Simplifying the expression, we have:

v = (11m / 20s) * (100cm / 1m) = 55cm/s

Therefore, the speed of the second mouse is 55cm/s.

Answer

The speed of the second mouse is 55cm/s.