Question

Автомобиль едет со скоростью 53 км/ч по залитой дождём дороге, как вдруг замечает человека, пересекающего проезжую часть. Какое время потребуется автомобилю до полной остановки, если он начал торможение с ускорением −2,3 м/с2?

Answer 1

Ответ:

Около 23,04 с

Объяснение:

В формулу для ускорения подставляешь всё известное, затем выражаешь неизвестное. Конечная скорость 0, начальная 53 (тормозит ведь)

Answer 2

Answer in detail. A car is driving at a speed of 53 km/h on a road flooded with rain, when it suddenly notices a person crossing the road. How long will it take the car to stop completely if it started braking with an acceleration of -2.3 m/s2?

To answer this question, we need to use the formula for the final velocity of a uniformly accelerated motion:

v = v0 + at

where v is the final velocity, v0 is the initial velocity, a is the acceleration, and t is the time.

We want to find the time t when the car stops completely, so we set v to zero. We also need to convert the initial velocity from km/h to m/s by multiplying it by 1000/3600. So we have:

0 = (53 * 1000/3600) + (-2.3) * t

Solving for t, we get:

t = (53 * 1000/3600) / 2.3

t = 6.35 seconds

Therefore, it will take the car 6.35 seconds to stop completely if it started braking with an acceleration of -2.3 m/s2.

You can find more information about uniformly accelerated motion and how to solve similar problems on this website.