x$($t$)=$xi$+$vit$+12$at$2$x$($t$)=$xi$+$vit$+12$at$2,$

v$($t$)=$vi$+$atv$($t$)=$vi$+$at$,$

where the symbols are defined as follows:

x$($t$)$x$($t$)$ is the position of the particle at time tt;

xixi is the initial position of the particle;

v$($t$)$v$($t$)$ is the velocity of the particle at time tt;

vivi is the initial velocity of the particle;

aa is the acceleration of the particle.

In answering the following questions, assume that the acceleration is constant and nonzero: a$0$a$0.$

Part A

The quantity represented by xx is a function that changes over time $($i$.$e$.,$ is not constant$).$

truefalse