## Item FM069005: Use of tables of speed versus time, and information about forces acting on an object, to determine the object's speed at various times.

At 9 o’clock in the morning (9:00 am), an object is moving at a speed of 10 meters per second (m/s). It continues to move at that speed. At exactly 9:02 am, a single constant force begins to act on the object in the direction opposite to the direction of the object's motion. This force continues to act during the time shown in the table.

Time → 9:00 am 9:01 am 9:02 am 9:03 am 9:04 am 9:05 am 9:06 am
Row A 10 m/s 10 m/s 10 m/s 9 m/s 8 m/s 8 m/s 8 m/s
Row B 10 m/s 10 m/s 10 m/s 10 m/s 10 m/s 9 m/s 8 m/s
Row C 10 m/s 10 m/s 10 m/s 9 m/s 8 m/s 7 m/s 6 m/s
Row D 10 m/s 10 m/s 10 m/s 10 m/s 7 m/s 7 m/s 7 m/s

Which row of the table shows what the object’s speed could be each minute? 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

Percent of students responding correctly

 Overall 54% Grades 6–8 52% Grades 9–12 59% Male 57% Female 53% Primary Language is English 55% Primary Language is not English 43%