Question

Дано : t = 20с. Vo = 72км/ч. V = 54км/ч. Найти : a - ?

Answer 1

Вот так получилось, только не знаю почему отрицательно

Answer 2

Calculating Acceleration

To find the acceleration (a), we can use the following equation of motion:

V = Vo + at

Where: - V = final velocity = 54 km/h - Vo = initial velocity = 72 km/h - t = time = 20 s

First, let's convert the velocities from km/h to m/s for consistency: - V = 54 km/h = 15 m/s - Vo = 72 km/h = 20 m/s

Now, we can use the equation to solve for acceleration (a): - 15 = 20 + a * 20

Solving for a: - a = (15 - 20) / 20 - a = -5 / 20 - a = -0.25 m/s^2

So, the acceleration (a) is -0.25 m/s^2.