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Item EG081006: Two objects that are moving at the same speed must have different masses in order to have different amounts of motion energy.

Two objects are moving at the same speed. The objects have different amounts of kinetic energy (motion energy). Which of the following must be true?

  1. The objects are different sizes.
  2. The objects have different masses.
  3. The objects are made of different materials.
  4. The objects are moving in different directions.
Distribution of Responses
Chart showing distrubtion of responses for Item 081006
Scale Score for Item Difficulty
(200[Easy]-800[Difficult])
473
Students Responding Correctly
Group Correct Total Percent
Overall 851 1517 56%
Grades
  4–511828541%
  6–8 346 640 54%
  9–12 387 592 65%
Gender
  Male39973854%
  Female44275459%
Primary Language
  English740128757%
  Other9218949%

View data table