A motorcycle moves along a straight road, and its velocity is recorded at each second as follows: at $1$ s, $0$ m/s; at $2$ s, $0$ m/s; at $3$ s, $2$ m/s; at $4$ s, $5$ m/s. At which second does the motorcycle first begin to have positive acceleration?

An object always accelerates in the same direction as which of the following?

An object starts from rest and accelerates uniformly at $2 m/s^2$. What is its velocity ten seconds after starting from rest?

In the context of one-dimensional motion, at what point during its motion is an object's $a$ (acceleration) equal to $0$?

When an object is released with an initial velocity upward near $E{a}^{r}th$'s surface, in what direction does it accelerate?

If the change in velocity of an object ($\mathrm{\Delta v}$) increases while the time interval ($\mathrm{\Delta t}$) remains constant, what happens to the acceleration ($a$) of the object?

Which of the following best describes positive $a$?

Acceleration is a vector. What does that mean?$a$ is a $\overrightarrow{a}$.