Question

Скільки часу потрібно, щоб автомобіль змiнив швидкість руху від 72км/год до 10 м/с. Прискорення дорівнює 4 м/с2. Кто не знает украинский, перевела на русский⤵️Сколько времени нужно, чтобы автомобиль изменил скорость движения от 72 км/ч до 10 м/с. Ускорение равняется 4 м/с2.

Answer 1

Ответ:

1) S=V²VO²/2a; V=20²/1=400м

2)V=VO-at; 0=V0-at ; at=V0; t=V0/a=40c

3)V=V0-at; V=20-0,5*30=20-15-5 м/с

Объяснение:

Це правильне розв'язування

Answer 2

Calculation of Time Required for Change in Speed

To calculate the time required for an automobile to change its speed from 72 km/h to 10 m/s, we can use the formula:

Time = Change in Speed / Acceleration

Given: - Initial speed (u) = 72 km/h - Final speed (v) = 10 m/s - Acceleration (a) = 4 m/s^2

First, let's convert the initial speed from km/h to m/s: - 1 km/h = 1000 m/3600 s = 5/18 m/s - Initial speed (u) = 72 km/h * (5/18 m/s) = 20 m/s

Now we can calculate the change in speed: - Change in speed = Final speed (v) - Initial speed (u) = 10 m/s - 20 m/s = -10 m/s

Since the change in speed is negative, it means the automobile is decelerating.

Now we can calculate the time required using the formula: - Time = Change in Speed / Acceleration = (-10 m/s) / (4 m/s^2) = -2.5 s

The negative sign indicates that the change in speed is opposite to the direction of acceleration. Therefore, it will take approximately 2.5 seconds for the automobile to change its speed from 72 km/h to 10 m/s with an acceleration of 4 m/s^2.