2. 1D Motion / Kinematics

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?

Which of the following examples accurately describes an object that is accelerating?

Which of the following is an example of acceleration?

Suppose an object is in free fall near Earth's surface and air resistance is negligible. Each second, the object falls:

An automobile is originally at rest at $s=0$. If it accelerates uniformly at $a=2m/s^2$, what is its position after $t=3s$?

A car's velocity changes from $10m/s$ to $8m/s$ in $5s$. What is the acceleration of the car?

Three objects, A, B, and C, each with different masses, are acted upon by the same net force. Which object experiences the greatest acceleration?

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

If a painter is at rest on a scaffold, what can be said about the net force acting on the painter?

In the context of motion, which physical quantity is defined as the change in velocity divided by the change in time? $a=\frac{\Delta v}{\Delta t}$

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

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

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?

If an object is not accelerating, which of the following statements is true?

A car slows down from $65\mathrm{km}/s$ to $30\mathrm{km}/s$ in $5s$. What is its acceleration?