Two Children Start at One End of a Street, the Origin

question 35

Multiple Choice

Two children start at one end of a street, the origin, run to the other end, then head back. On the way back Joan is ahead of Mike. At this moment in time, which statement is correct about the distances run and the displacements from the origin?

• A)Joan has run a greater distance and her displacement is greater than Mike's.
• B)Mike has run a greater distance and his displacement is greater than Joan's.
• C)Joan has run a greater distance, but her displacement is less than Mike's.
• D)Mike has run a greater distance, but his displacement is less than Joan's.
• E)Mike has run a shorter distance, and his displacement is less than Joan's.

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Definitions:

Clinical Trial

A research design that tests the effects of medical treatment. Many clinical trials are randomized controlled trials that allow researchers to determine whether a new treatment is or is not effective.

Ex Post Facto Study

A research design that examines the effects of an independent variable on a dependent variable, where the study is conducted after the events have occurred.

Independent Variable

In research, a variable that is manipulated or changed to observe its effect on a dependent variable.

Longitudinal Studies

Research design that involves repeated observations of the same variables over short or long periods of time.