Question

З яким прискоренням рухався автомобіль під час аварійного гальмування, якщо водієві вдалося зупинити автомобіль, що рухався зі швидкістю 54 км/год, за 5 с,якою була швидкість руху автомобіля через 2,5 секунди рісля початку гальмування?

Answer 1

Ответ:

см фото

Объяснение:

Answer 2

To calculate the acceleration of the car during emergency braking, we can use the formula:

acceleration = (final velocity - initial velocity) / time

Given that the car was traveling at a speed of 54 km/h (or 15 m/s) and was able to stop within 5 seconds, we can calculate the acceleration.

Calculation:

Initial velocity (u) = 15 m/s Final velocity (v) = 0 m/s (since the car stopped) Time (t) = 5 s

Using the formula, we can calculate the acceleration:

acceleration = (0 - 15) / 5 = -3 m/s^2

The negative sign indicates that the car is decelerating or slowing down.

Now, let's calculate the speed of the car 2.5 seconds after the start of braking.

Calculation:

Initial velocity (u) = 15 m/s Acceleration (a) = -3 m/s^2 Time (t) = 2.5 s

Using the formula for calculating the final velocity:

final velocity = initial velocity + (acceleration * time)

final velocity = 15 + (-3 * 2.5) = 15 - 7.5 = 7.5 m/s

Therefore, the speed of the car 2.5 seconds after the start of braking is 7.5 m/s.

Please note that these calculations assume constant acceleration during the entire braking process. In reality, factors such as friction, air resistance, and the condition of the road may affect the actual acceleration and stopping distance of the car.

Answer 3

To calculate the acceleration of the car during emergency braking, we can use the formula:

acceleration = (final velocity - initial velocity) / time

Given that the car was traveling at a speed of 54 km/h (or 15 m/s) and was able to stop within 5 seconds, we can calculate the acceleration as follows:

acceleration = (0 m/s - 15 m/s) / 5 s = -3 m/s²

The negative sign indicates that the car is decelerating or slowing down.

Now, let's calculate the speed of the car after 2.5 seconds of braking. We can use the formula:

final velocity = initial velocity + (acceleration * time)

Substituting the values into the formula:

final velocity = 15 m/s + (-3 m/s² * 2.5 s) = 7.5 m/s

Therefore, the speed of the car after 2.5 seconds of braking is 7.5 m/s.

Please note that the above calculations assume constant acceleration during the entire braking process. In reality, the acceleration may vary depending on various factors such as road conditions, braking force, and the performance of the braking system.