Question

Автомобиль движется со скоростью 64 км/ч при подъеме в гору он замедляет скорость и в течении 0,5 мин проходит 450м. Определить скорость автомобиля в конце пути и величину ускорения, считая его постоянным.

Answer 1

Ответ:

Объяснение:

60 км/ч=17,778 м/с

v=S/t=450 м/0,5 мин=900 м/мин=54 км/ч=15 м/с (скорость автомобиля в конце пути)

a=(v-v0)/t=(17,778 м/с-15 м/с)/0,5 с=5,556 м/с2

Answer 2

Ответ:

Объяснение:

дано Vo=64 км/ч=17,78 м/с

t=30с

S=450 м

V- ?

a- ?

1)   S=(V+Vo)*t/2

V=2*S/t -Vo=30-17,78=12,22 м/с

2) a=(V-Vo)/t=(12,22-17.78)/30=- 0,185 м/с2

Answer 3

Given Information:

- The car is moving uphill with a speed of 64 km/h. - It slows down and covers a distance of 450 meters in 0.5 minutes.

Calculating the Final Speed:

To determine the final speed of the car, we need to convert the time from minutes to hours and calculate the average speed during the given time interval.

Given: - Initial speed (u) = 64 km/h - Distance (s) = 450 meters - Time (t) = 0.5 minutes

Converting time to hours: - 0.5 minutes = 0.5/60 hours = 0.00833 hours

Calculating average speed: - Average speed (v) = Distance/Time = 450 meters / 0.00833 hours = 54000 meters/hour

Converting average speed to km/h: - 54000 meters/hour = 54 km/h

Therefore, the final speed of the car at the end of the given distance is 54 km/h.

Calculating the Acceleration:

To calculate the acceleration, we need to use the formula:

Acceleration (a) = (Final Speed - Initial Speed) / Time

Given: - Initial speed (u) = 64 km/h - Final speed (v) = 54 km/h - Time (t) = 0.5 minutes

Converting time to hours: - 0.5 minutes = 0.5/60 hours = 0.00833 hours

Calculating acceleration: - Acceleration (a) = (54 km/h - 64 km/h) / 0.00833 hours = -120 km/h^2

Therefore, the magnitude of the acceleration of the car is 120 km/h^2.

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