Suppose an object moves in a straight line and its velocity versus time graph is a straight line with a constant positive slope. During what period is the $a$cceleration constant?

If a ball is thrown straight up into the air, what is its acceleration as it moves upward?

A car initially at rest accelerates uniformly and reaches a speed of $20m/s$ in $5s$. What is the magnitude of the acceleration during this speeding up phase?

A car accelerates uniformly from rest with a constant acceleration $a$. Which equation gives the velocity $v$ of the car after time $t$?

Four cars each start from rest and accelerate uniformly. Car A accelerates at $2 m/s^2$ for $5$ seconds, Car B at $3 m/s^2$ for $4$ seconds, Car C at $4 m/s^2$ for $3$ seconds, and Car D at $5 m/s^2$ for $2$ seconds. Which car reaches the greatest final velocity?

An object moves along the x-axis with its acceleration as a function of time shown in Figure 1. At time $t=0$ s, its velocity is $v_x=2.0m/s$. If the acceleration is constant and equal to $3.0m/s^2$ for $0\le t\le 4$ s, what is the velocity at $t=4$ s?

A car starts from rest and accelerates at a constant rate of $a$ for a time $t$. What is the car's final velocity?

Given a motion diagram showing an object speeding up in a straight line, which of the following correctly shows the $a$ vectors added to the diagram?