A Spaceship Is Moving in a Straight Line at a Speed

question 5

Multiple Choice

A spaceship is moving in a straight line at a speed of 0.8 c (relative to Earth) .It launches a missile that moves away from the spaceship (traveling in the same direction as the spaceship) at a speed of 0.6 c.Relative to Earth,the speed of the missile is

• A)greater than 0.8 c and less than c.
• B)1.4 c.
• C)c.
• D)greater than c and less than 1.4 c.

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Definitions:

Parallel Forms

A method of reliability assessment in psychometrics where two different versions of a test are used to measure the same construct, to check for consistency.

Interrater

Relates to the degree of agreement among independent observers or raters evaluating the same phenomenon.

Predictive Validity

The extent to which a score or measurement can accurately predict future performance or behavior.

Concurrent Validity

A measure of how well a particular test correlates with a previously validated measure.