notes

Pos

scopus affil quant author pos

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two intervals const a p3

Position $$\tag{D3} x(t) = \left\{ \begin{array}{cc} x_0 + v_0(t - t_0) + \tfrac12 a_0(t - t_0)^2, & t_0 \le t < t_1, \\[0.5em] x_1 + v_1(t - t_1) + \tfrac12 a_1(t - t_1)^2, & t_1 \le t < t_2, \end{array} \right. $$ with $t_{n+1} = t_n + \tau_n$, where $\tau_n$ is $n$-th time interval. Initial conditions $x(t_0) = x_0$, $x(t_1) = x_1$ and $x(t_1) = x_0 + v_0(t_1 - t_0) + \tfrac12 a_0(t_1 - t_0)^2$.

two intervals const a p2

Velocity $$\tag{D2} v(t) = \left\{ \begin{array}{cc} v_0 + a_0(t - t_0), & t_0 \le t < t_1, \\[0.5em] v_1 + a_1(t - t_1), & t_1 \le t < t_2, \end{array} \right. $$ with $t_{n+1} = t_n + \tau_n$, where $\tau_n$ is $n$-th time interval. Initial conditions $v(t_0) = v_0$, $v(t_1) = v_1$ and $v(t_1) = v_0 + a_0(t_1 - t_0)$.

two intervals const a p1

Acceleration $$\tag{D1} a(t) = \left\{ \begin{array}{cc} a_0, & t_0 \le t < t_1, \\[0.5em] a_1, & t_1 \le t < t_2, \end{array} \right. $$ with $t_{n+1} = t_n + \tau_n$, where $\tau_n$ is $n$-th time interval.

a v x const a

Acceleration $$\tag{C1} a(t) = a_n, \ \ \ \ t_n < t < t_{n+1}. $$ Velocity $$\tag{C2} v(t) = v_n + a_n(t - t_n), \ \ \ \ t_n \le t \le t_{n+1}. $$ Posisition $$\tag{C3} x(t) = x_n + v_n(t - t_n) + \tfrac12 a_n(t - t_n)^2, \ \ \ \ t_n \le t \le t_{n+1}. $$

int v to x const a

Velocity $$\tag{B1} v(t) = v_n + a(t - t_n), \ \ \ \ t_n \le t \le t_{n+1}. $$ Initial condition $$\tag{B2} x(t_n) = x_n. $$ Posisition $$\tag{B3} x(t) = x_n + v_n(t - t_n) + \tfrac12 a_n(t - t_n)^2, \ \ \ \ t_n \le t \le t_{n+1}. $$

piecewise equal stops train

The inspiration comes while in the trip using subway. Assume that visited stations are evenly spaced in a straight line. The train accelerates for some amount of time, moves with a constant speed for some amount of time, and starts decelerating until it reaches the next station such that the same amount of time spent accelerating and decelerating are the same, and the magnitudes of both are the same. What would be a possible function that illustrates this scenario?