Question

Решить задачу автомобиль движеться со скоростью 72км/ч определить ускорение автомобиля если через 20 сек он остановиться

Answer 1

Дано
Vo=20 м/с
V=0
t=20 c
a-?
a=(V-Vo)/t     a=(0-20)/20=-1 м/с² торможение

Answer 2

Problem Analysis

To solve this problem, we need to determine the acceleration of a car that is initially moving at a speed of 72 km/h and comes to a stop after 20 seconds.

Calculation

Acceleration is defined as the change in velocity divided by the change in time. In this case, the change in velocity is from 72 km/h to 0 km/h, and the change in time is 20 seconds.

To convert the speed from km/h to m/s, we need to multiply it by 1000/3600. So, 72 km/h is equal to (72 * 1000) / 3600 = 20 m/s.

The acceleration can be calculated using the formula:

acceleration = (final velocity - initial velocity) / time

Substituting the given values:

acceleration = (0 - 20) / 20 = -1 m/s^2

Therefore, the acceleration of the car is -1 m/s^2.

Conclusion

The acceleration of the car is -1 m/s^2. This means that the car is decelerating at a rate of 1 meter per second squared until it comes to a stop after 20 seconds.

Please let me know if there is anything else I can help you with!