2. 1D Motion / Kinematics

In a $v-t$ graph where time is measured along the $x$-axis, what physical quantity is measured along the y-axis?

On a $d-t$ graph, why does a curved line indicate that the object is accelerating?

For a ball thrown straight upward, what are the velocity and acceleration of the ball at the highest point in its path?

Which of the following velocity-time graphs represents an object with negative acceleration?$a<0$