Acceleration 222

A truck heading east has an initial velocity of 6 m/s. It accelerates at 2 m/s2 for 12 seconds. What distance does the truck travel in the given time? 84 m 144 m 216 m 360 m

216 m

What is the displacement of the object from 2 seconds to 6 seconds? 4 m 8 m 16 m 24 m

24 m

What is the acceleration of the object? 0 m/s2 0.25 m/s2 4 m/s2 8 m/s2

4 m/s2

A runner moves west with an initial velocity of 4 m/s. She accelerates 3 m/s2 for 30 seconds. The runner's final velocity is m/s.

94

Deena made a chart to summarize features of a velocity vs. time graph for objects with constant acceleration and objects with constant velocity. Which best describes Deena's error? The line for constant velocity is not horizontal; it is diagonal and slopes downward. Include the area of the rectangle under the line to find displacement for constant acceleration. Find acceleration by finding the area of the rectangle above the line. Find velocity by calculating the slope of the line.

Include the area of the rectangle under the line to find displacement for constant acceleration.

Which best describes the motion of the object between 1 and 4 seconds? The object has decreasing acceleration and increasing velocity. The object has positive acceleration and eventually stops. The object has decreasing acceleration and decreasing velocity. The object has negative acceleration and eventually stops.

The object has negative acceleration and eventually stops.

Which parts of the graph represents the object moving at a constant, positive acceleration? W and X X and Y Y and Z W and Z

W and X

The of the line on a velocity vs. time graph represents acceleration.

slope

Suppose the initial position of an object is zero, the starting velocity is 3 m/s and the final velocity was 10 m/s. The object moves with constant acceleration. Which part of a velocity vs. time graph can be used to calculate the displacement of the object? the area of the rectangle under the line the area of the rectangle above the line the area of the rectangle plus the area of the triangle under the line the area of the rectangle plus the area of the triangle above the line

the area of the rectangle plus the area of the triangle under the line