Question

два мальчика одновременно пебежали навстречу друг другу по спортивной дорожке,длина которой 200 метров.они встретились через 20 секунд.первый бежал со скоростью 5метро/секунду.с какой скоростью бежал второй мальчик?

Answer 1

1 способ

1) 5 х 20 = 100 (м) - пробежал первый до встречи.

2) 200 - 100 = 100 (м) - пробежал до встречи другой.

3) 100 : 20 = 5 (м/с) - скорость второго.

 

2 способ:

1) 200 : 20 = 10 (м/с) -  скорость сближения мальчиков.

2) 10 - 5 = 5 (м/с) скорость второго. 

Answer 2

200:20=10(м/с)-скорость сближения мальчиков 10-5=5(м/с) скорость второго

Answer 3

Problem Analysis

Two boys are running towards each other on a sports track with a length of 200 meters. They meet after 20 seconds. The speed of the first boy is given as 5 meters per second. We need to determine the speed of the second boy.

Solution

To find the speed of the second boy, we can use the formula: speed = distance / time.

The distance covered by the first boy can be calculated by multiplying his speed (5 meters per second) by the time (20 seconds). This gives us a distance of 100 meters.

Since the boys are running towards each other, the total distance covered by both boys is equal to the length of the track, which is 200 meters.

To find the distance covered by the second boy, we subtract the distance covered by the first boy (100 meters) from the total distance (200 meters). This gives us a distance of 100 meters.

Now, we can calculate the speed of the second boy by dividing the distance (100 meters) by the time (20 seconds):

Speed of the second boy = distance / time = 100 meters / 20 seconds = 5 meters per second.

Therefore, the second boy is also running at a speed of 5 meters per second.

Answer

The second boy is running at a speed of 5 meters per second.