Item FM103001: Use of tables of speed versus time, and information about forces acting on an object, to determine the object's speed at various times.

An object is moving. Every second, the object’s speed is measured. When the clock reads 0 seconds, the object’s speed is 20 miles per hour (mi/hr). When the clock reads 2 seconds, a single constant force begins to act that slows the object down. This force continues to act during the time shown in the table.

Clock → 0 seconds 1 second 2 seconds 3 seconds 4 seconds 5 seconds 6 seconds
Row A 20 mi/hr 20 mi/hr 20 mi/hr 20 mi/hr 20 mi/hr 18 mi/hr 16 mi/hr
Row B 20 mi/hr 20 mi/hr 20 mi/hr 18 mi/hr 16 mi/hr 16 mi/hr 16 mi/hr
Row C 20 mi/hr 20 mi/hr 20 mi/hr 18 mi/hr 16 mi/hr 14 mi/hr 12 mi/hr
Row D 20 mi/hr 20 mi/hr 20 mi/hr 20 mi/hr 14 mi/hr 14 mi/hr 14 mi/hr

Which row of the table could be a correct representation of the object’s speed between 0 seconds and 6 seconds? Assume that if a change in speed has occurred, the change is shown in the table.

  1. Row A
  2. Row B
  3. Row C
  4. Row D

Distribution of Responses

Chart showing distrubtion of responses for Item FM103001

Percent of students responding correctly

Overall60%
Grades 6–856%
Grades 9–1265%
Male62%
Female58%
Primary Language is English61%
Primary Language is not English53%

View data table