Question

Знайти середню швидкість автомобіля, якщо він проїхав першу ділянку щляху зі швидкістю 100 км/год, другу - зі швидкістю 40 км/год, якщошлях на першій та другій ділянці однаковий.

Answer 1

Первая часть пути равна $V_{1}$t; вторая часть $V_{2}$t;
Средняя скорость за время 2t равна
V=$(V_{1}t + V_{2}t)/(2t)= (V_{1} + V_{2})/2=70$

Answer 2

Дано S1=S2=S/2     V1=100 км/ч    V2=40 км/ч    Vср- ?

Vср=S/(t1+t2)= S/(S/2*V1   +S/2*V2)=2*V1*V2/(V1+V2)=2*40*100/140=
=8000/140=57,14 км/ч

Answer 3

Finding the Average Speed of a Car

To find the average speed of a car, we need to calculate the total distance traveled and the total time taken. In this case, the car traveled two different distances with different speeds, but the distances were the same. Let's calculate the average speed step by step.

1. Calculate the total distance traveled: - Since the distances on both sections of the road are the same, we can consider the distance as a single value. Let's call it "d." - The car traveled the first section of the road at a speed of 100 km/h and the second section at a speed of 40 km/h. - Therefore, the total distance traveled is 2d (d for the first section and d for the second section).

2. Calculate the total time taken: - The time taken to travel the first section of the road can be calculated by dividing the distance (d) by the speed (100 km/h). This gives us