Question

Поезд трогается с места с ускорением 0.75 м/с.(в квадрате).За какое время он пройдёт 1.5 км?

Answer 1

путь=ускорение*квадрат времени/2

отсюда

время=корень из 2*путь/ускорение=корень из 3000*2/0,75=89,44 сек

 

Answer 2

S = a*t*t/2, 1500м = 0,75*t*t/2 решаем уравнение t = 63.5 сек

Answer 3

Calculation of Time Taken by the Train

To calculate the time taken by the train to travel a distance of 1.5 km, we need to use the equation of motion:

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

Where: - s is the distance traveled (1.5 km), - u is the initial velocity (0 m/s), - a is the acceleration (0.75 m/s^2), - t is the time taken.

We can rearrange the equation to solve for t:

\[t = \sqrt{\frac{2s}{a}}\]

Substituting the given values, we get:

\[t = \sqrt{\frac{2 \times 1.5}{0.75}}\]

Simplifying the equation:

\[t = \sqrt{4}\]

Therefore, the time taken by the train to travel 1.5 km is 2 seconds.

Please note that the above calculation assumes that the train starts from rest and accelerates uniformly.