Question

Автомобиль, двигаясь с ускорением 2м/с2, за 5с прошёл 125 м.Найдите начальную скорость автомобиля.

Answer 1

Решение в скане................

Answer 2

Calculation of Initial Velocity

To find the initial velocity of the car, we can use the equation of motion:

\[S = ut + \frac{1}{2}at^2\]

Where: - S is the distance traveled (125 m) - u is the initial velocity (what we want to find) - t is the time taken (5 s) - a is the acceleration (2 m/s^2)

Plugging in the given values, we can solve for u:

\[125 = u \cdot 5 + \frac{1}{2} \cdot 2 \cdot 5^2\]

Simplifying the equation:

\[125 = 5u + 25\]

Rearranging the equation to solve for u:

\[5u = 125 - 25\]

\[5u = 100\]

\[u = \frac{100}{5}\]

\[u = 20\]

Therefore, the initial velocity of the car is 20 m/s.