Question

Камаз движется по главной дороге и на участке дороги с ограничением скорости движется равномерно и прямолинейно, соблюдая скоростной режим. Достигнув перекрестка (конец ограничения скорости), машина начинает ускоряться следующим образом: за 4 с проходит 70 м, а потом за 5 с — 150 м. С точностью до десятых определи: а) начальную скорость грузовика: v0 = м/с. б) ускорение грузовика: a= м/с².​ Помогите пожалуйста

Answer 1

Ответ:

70м за 4 сек

5сек 150м

первоначальная скорость 67кмч разгон до 100кмч

Answer 2

Calculation of Initial Velocity and Acceleration of the Kamaz Truck

To determine the initial velocity (v0) and acceleration (a) of the Kamaz truck, we can use the information provided about its motion after reaching the intersection.

According to the information given, the truck covers a distance of 70 meters in 4 seconds and then covers a distance of 150 meters in the next 5 seconds. We can use the equations of motion to calculate the initial velocity and acceleration.

Let's start by calculating the average velocity during the first 4 seconds:

Average velocity (v_avg) = (final distance - initial distance) / time

The final distance is 70 meters, the initial distance is 0 meters, and the time is 4 seconds.

v_avg = (70 m - 0 m) / 4 s = 17.5 m/s

Since the truck is moving uniformly, the average velocity is equal to the initial velocity.

Initial velocity (v0) = 17.5 m/s

Next, let's calculate the average velocity during the next 5 seconds:

Average velocity (v_avg) = (final distance - initial distance) / time

The final distance is 150 meters, the initial distance is 70 meters, and the time is 5 seconds.

v_avg = (150 m - 70 m) / 5 s = 16 m/s

Now, let's calculate the acceleration using the formula:

Acceleration (a) = (change in velocity) / time

The change in velocity is the difference between the final velocity and the initial velocity, and the time is 5 seconds.

a = (16 m/s - 17.5 m/s) / 5 s = -1.5 m/s²

Therefore, the initial velocity (v0) of the Kamaz truck is 17.5 m/s and the acceleration (a) is -1.5 m/s².

Please note that the negative sign indicates that the truck is decelerating or slowing down during the second phase of motion.