Question

Лыжник спускается с горы длинно 100 м ускорение равно 0,5м/с² начальная скорость 10м/с.Сколько времени займёт спуск?

Answer 1

Ответ: ~8с Смотрите решение на фото ниже

Answer 2

Calculating Time Taken for Descent

To calculate the time taken for the skier to descend the mountain, we can use the following kinematic equation:

s = ut + (1/2)at^2

Where: - s = displacement (100 m) - u = initial velocity (10 m/s) - a = acceleration (-0.5 m/s^2, negative because it's deceleration) - t = time taken

First, let's rearrange the equation to solve for t:

t = (v - u) / a

Where: - v = final velocity (0 m/s, as the skier comes to a stop)

Now, we can calculate the time taken using the given values: - s = 100 m - u = 10 m/s - a = -0.5 m/s^2 - v = 0 m/s

Calculation

Using the formula t = (v - u) / a, we can calculate the time taken for the descent:

t = (0 - 10) / (-0.5) t = 20 / 0.5 t = 40 seconds

So, the skier will take approximately 40 seconds to descend the mountain.