Question

Каков модуль вектора ускорения автомобиля при торможении,если при скорости 108 км/ч время полного торможения 15 с?

Answer 1

A=V-V0/t=0-30/15=-2 м/с2

Answer 2

Calculating the Acceleration Vector Module during Braking

To calculate the acceleration vector module during braking, we can use the formula:

Acceleration (a) = Change in Velocity (Δv) / Time (t)

First, we need to convert the speed from km/h to m/s, as the standard unit for acceleration is m/s^2.

Given: - Initial speed (u) = 108 km/h - Time for complete braking (t) = 15 s

Converting the initial speed from km/h to m/s: Initial speed (u) = 108 km/h = 30 m/s Now, we can calculate the acceleration using the formula: Acceleration (a) = Change in Velocity (Δv) / Time (t)

Since the car is coming to a complete stop, the final velocity (v) is 0 m/s.

Change in Velocity (Δv) = Final Velocity (v) - Initial Velocity (u) Change in Velocity (Δv) = 0 m/s - 30 m/s = -30 m/s

Now, we can calculate the acceleration: Acceleration (a) = -30 m/s / 15 s = -2 m/s^2

So, the module of the acceleration vector during braking, when the car is traveling at a speed of 108 km/h and takes 15 seconds to come to a complete stop, is 2 m/s^2.