Question

Гальмо легкового автомобіля є справним,якщо за швидкості 8 м/с гальмівний шлях автомобіля дорівнює 7,2м. Визначте час гальмування та прискорення руху автомобіля.​

Answer 1

Ответ:

а≈4.44 м/с² t=1.8 c

Объяснение:

S=v0t-(at²)/2

V=V0-at; V=0

V0=at; a=V0/t

S=V0t-(V0t)/2=(2*V0t-V0t)/2=V0t/2

S=V0t/2; t=2S/V0=2*7.2/8=1.8 с

a=V0/t=8/1.8≈4.44 м/с²

Answer 2

Given Information:

- Speed of the car: 8 m/s - Braking distance of the car: 7.2 m

Calculating Time of Braking:

To calculate the time of braking, we can use the formula:

Time = Distance / Speed

Substituting the given values, we get:

Time = 7.2 m / 8 m/s

Calculating the result:

Time = 0.9 seconds

Therefore, the time of braking for the car is 0.9 seconds.

Calculating Acceleration:

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

Acceleration = Change in Velocity / Time

Since the car is braking, the change in velocity is equal to the initial velocity (8 m/s) because the car comes to a stop. The final velocity is 0 m/s.

Substituting the values, we get:

Acceleration = (0 m/s - 8 m/s) / 0.9 seconds

Calculating the result:

Acceleration = -8.89 m/s^2

Therefore, the acceleration of the car during braking is approximately -8.89 m/s^2. The negative sign indicates that the car is decelerating.

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