Question

Средняя скорость тела за 20 сек движения составила 4м/c . средняя скорость этого же тела за последние 4 секунды движения составила 10 м/с определите среднюю скорость тела за первые 16 сек

Answer 1

Сегодня решал
v ср = S/t = (v1*t1+v2*t2)/t1+t2)
v1=(vср*(t1+t2)-v2*t2)|t1=(4*20-10*4)/16= 2,5 м/с
но утром я ошибся )))

Answer 2

Calculating Average Speed

To calculate the average speed of the object for the first 16 seconds, we can use the formula:

Average Speed = Total Distance / Total Time

The total distance covered by the object remains the same, so we only need to calculate the total time for the first 16 seconds.

Calculation

The average speed for the first 16 seconds can be calculated as follows:

Total Time for the First 16 Seconds = 16 seconds

Using the given information: - Average speed for 20 seconds = 4 m/s - Average speed for the last 4 seconds = 10 m/s

We can calculate the total distance covered by the object and then use it to find the average speed for the first 16 seconds.

Total Distance Covered

The total distance covered by the object can be calculated using the average speed for 20 seconds: Total Distance = Average Speed × Total Time Total Distance = 4 m/s × 20 s Total Distance = 80 meters

Now, we can calculate the average speed for the first 16 seconds using the total distance and the total time for the first 16 seconds.

Average Speed for the First 16 Seconds

Average Speed = Total Distance / Total Time Average Speed = 80 meters / 16 seconds Average Speed = 5 m/s

So, the average speed of the object for the first 16 seconds is 5 m/s.