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Use the motion map to answer the question.

A motion map. The position line is a long black arrow pointing right, labeled x. Above the line are 2 dots with a vector pointing away from x that start at x, each one shorter. Above that are two yellow vectors pointing toward x, each positioned to the left of a dot. A vertical row of 3 black dots appear in the center of the position line, where the bottom dot is aligned with the yellow arrows and the top dot has a vector pointing away from the origin. There is one other dot with a longer vector arrow to the right of the top dot. Above this line are 2 yellow arrows pointing away from the origin.

Which scenario could be represented by the motion map?

A car speeds up to merge onto the freeway and then continues at a constant velocity.
A car speeds up to pass a truck, then slows down to a constant velocity.
A car slows to stop at a stop sign. Once traffic is clear, the car speeds up.
A car slows to makes a U-turn, then continues in the opposite direction.

1 answer

Based on the description of the motion map, we can analyze the various components present to determine which scenario it represents.

  1. Two dots with shorter vectors pointing away from the origin suggests initial motion where the object is speeding up (vectors pointing away from the position line increase in size).
  2. Additional yellow vectors pointing toward x indicates a deceleration in this region.
  3. A black dot aligned with these yellow arrows shows a point of slowing/stop.
  4. A longer vector to the right of the top dot could indicate a resumed increase in speed or ongoing motion to the right (possibly indicating a constant velocity after slowing down).
  5. Two yellow arrows pointing away from the origin suggest an acceleration in the opposite direction, showing a potential increase in speed after a stop.

Considering all of these points, the best fit appears to be:

"A car slows to stop at a stop sign. Once traffic is clear, the car speeds up."

This matches the description of initial acceleration, followed by a slowdown (indicated by vectors toward the position) at a stop, and then again acceleration represented by the longer arrow for speed once clear of obstacles.