Q2.1 This is the x–t graph of the motion of a particle. Of the four points P, Q, R, and S, 1. the velocity vx is greatest (most positive) at point P 2. the velocity vx is greatest (most positive) at point Q 3. the velocity vx is greatest (most positive) at point R 4. the velocity vx is greatest (most positive) at point S 5. not enough information in the graph to decide

A2.1 This is the x–t graph of the motion of a particle. Of the four points P, Q, R, and S, 1. the velocity vx is greatest (most positive) at point P 2. the velocity vx is greatest (most positive) at point Q 3. the velocity vx is greatest (most positive) at point R 4. the velocity vx is greatest (most positive) at point S 5. not enough information in the graph to decide

Q2.2 This is the x–t graph of the motion of a particle. Of the four points P, Q, R, and S, 1. the speed is greatest at point P 2. the speed is greatest at point Q 3. the speed is greatest at point R 4. the speed is greatest at point S 5. not enough information in the graph to decide

A2.2 This is the x–t graph of the motion of a particle. Of the four points P, Q, R, and S, 1. the speed is greatest at point P 2. the speed is greatest at point Q 3. the speed is greatest at point R 4. the speed is greatest at point S 5. not enough information in the graph to decide

Q2.3 This is the x–t graph of the motion of a particle. Of the four points P, Q, R, and S, 1. the acceleration ax is greatest (most positive) at point P 2. the acceleration ax is greatest (most positive) at point Q 3. the acceleration ax is greatest (most positive) at point R 4. the acceleration ax is greatest (most positive) at point S 5. not enough information in the graph to decide

A2.3 This is the x–t graph of the motion of a particle. Of the four points P, Q, R, and S, 1. the acceleration ax is greatest (most positive) at point P 2. the acceleration ax is greatest (most positive) at point Q 3. the acceleration ax is greatest (most positive) at point R 4. the acceleration ax is greatest (most positive) at point S 5. not enough information in the graph to decide

Q2.4 You toss a ball straight upward, in the positive direction. The ball falls freely under the influence of gravity. At the highest point in the ball’s motion, 1. its velocity is zero and its acceleration is zero 2. its velocity is zero and its acceleration is positive (upward) 3. its velocity is zero and its acceleration is negative (downward) 4. its velocity is positive (upward) and its acceleration is zero 5. its velocity is positive (upward) and its acceleration is zero

A2.4 You toss a ball straight upward, in the positive direction. The ball falls freely under the influence of gravity. At the highest point in the ball’s motion, 1. its velocity is zero and its acceleration is zero 2. its velocity is zero and its acceleration is positive (upward) 3. its velocity is zero and its acceleration is negative (downward) 4. its velocity is positive (upward) and its acceleration is zero 5. its velocity is positive (upward) and its acceleration is zero

Q2.5 This is a motion diagram of an object moving along the x–direction with constant acceleration. The dots 1, 2, 3, … show the position of the object at equal time intervals ∆t. At the time labeled 3, the object has 1. negative velocity and zero acceleration 2. negative velocity and positive acceleration 3. negative velocity and negative acceleration 4. positive velocity and positive acceleration 5. positive velocity and negative acceleration

A2.5 This is a motion diagram of an object moving along the x–direction with constant acceleration. The dots 1, 2, 3, … show the position of the object at equal time intervals ∆t. At the time labeled 3, the object has 1. negative velocity and zero acceleration 2. negative velocity and positive acceleration 3. negative velocity and negative acceleration 4. positive velocity and positive acceleration 5. positive velocity and negative acceleration

Q2.6 This is a motion diagram of an object moving along the x–direction with constant acceleration. The dots 1, 2, 3, … show the position of the object at equal time intervals ∆t. Which of the following vx–t graphs best matches the motion shown in the motion diagram?

A2.6 This is a motion diagram of an object moving along the x–direction with constant acceleration. The dots 1, 2, 3, … show the position of the object at equal time intervals ∆t. Which of the following vx–t graphs best matches the motion shown in the motion diagram?

Q2.7 An object moves along the x–axis with constant acceleration. The initial position x0 is positive, the initial velocity is negative, and the acceleration is positive. Which of the following vx–t graphs best describes this motion?

A2.7 An object moves along the x–axis with constant acceleration. The initial position x0 is positive, the initial velocity is negative, and the acceleration is positive. Which of the following vx–t graphs best describes this motion?