Chapter 4 review

    Standardized test practice
    1. If the slope of a position versus time graph is decreasing, what does this indicate about velocity over time?
      1. Velocity is increasing.
      2. Velocity is decreasing.
      3. Velocity remains constant.
      4. Velocity is zero.

    2. Ruth throws a baseball straight up at 20 m/s. What is the ball’s velocity after 4 s?
      1. 10.2 m/s
      2. −19.2 m/s
      3. 16 m/s
      4. −76.8 m/s

      3. Moving cart begins moving downhill
    3. A cart is rolling along at a steady 2 m/s when it meets a slope. The cart accelerates at 1 m/s2 as it rolls down the hill. How far will the cart move in 3 s?
      1. 6 m
      2. 5 m
      3. 15 m
      4. 10.5 m

    4. If an object starts accelerating from rest at a rate of 34 m/s2, how far does it travel during the first second?
      1. 20 m
      2. 17 m
      3. 34 m
      4. 26 m

      5. Which diagram best represents negative velocity with a positive acceleration?
    5. Which of the four diagrams best represents a negative velocity with a positive acceleration? Assume the positive direction is to the right.
      1. A
      2. B
      3. C
      4. D

      How many of these objects are slowing down?
    1. Four different objects are moving along a horizontal axis, each with a different combination of velocity and acceleration as shown here. How many of these objects are slowing down?
      1. one
      2. two
      3. three
      4. four

    2. Jed drops a 1 kg box off of the Eiffel Tower. After 3 s, how fast is the box moving?
      1. 44.1 m/s
      2. 29.4 m/s
      3. 9.8 m/s
      4. 3.3 m/s

      3. Which velocity-time graph corresponds to the position-time graph?
    3. Only one of the four velocity–time graphs (above right) can possibly correspond to the single position–time graph (above left). Which is it?
      1. Graph A
      2. Graph B
      3. Graph C
      4. Graph D

    4. You are driving a metric car that has a speedometer that displays in meters per second. When you look down at your speedometer, you see that it reads 15 m/s. Four seconds later, you look down and it reads 23 m/s. What is your average acceleration over those 4 s?
      1. 5.75 m/s2
      2. 2 m/s2
      3. 3.75 m/s2
      4. 2.5 m/s2

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