Question

Решите на листочку Визначте модуль прискорення автомобіля під час гальмування, якщо за початкової швидкості руху 72 км/год час гальмування до повної зупинки стано-вить 10 с. Запишіть формулу залежності швидкості руху від часу. ​

Answer 1

Ответ:

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Answer 2

To find the acceleration of a car during braking, we can use the formula:

acceleration = change in velocity / time

Given that the initial velocity of the car is 72 km/h and the time taken to come to a complete stop is 10 seconds, we need to convert the velocity from km/h to m/s.

1 km/h is equal to 0.2778 m/s. So, the initial velocity is:

72 km/h * 0.2778 m/s = 20 m/s

The final velocity is 0 m/s since the car comes to a complete stop.

Now, we can calculate the change in velocity:

change in velocity = final velocity - initial velocity = 0 m/s - 20 m/s = -20 m/s

The negative sign indicates that the velocity is decreasing.

Finally, we can calculate the acceleration:

acceleration = change in velocity / time = -20 m/s / 10 s = -2 m/s^2

Therefore, the magnitude of the acceleration of the car during braking is 2 m/s^2.