An Object of Mass M Is Initially Moving at a Speed

question 14

Multiple Choice

An object of mass M is initially moving at a speed of 0.999 c and collides inelastically (they stick) with another identical object that was initially at rest.After the collision,the two objects are moving with a speed

• A)considerably greater than c/2.
• B)roughly equal to c/2.
• C)considerably less than c/2.

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Definitions:

Control Group

A group in an experiment or study that does not receive treatment by the researchers and is then used as a benchmark to measure how the other tested subjects do.

Masking

A method used in research where the participants and/or researchers are unaware of which individuals are in the control group and which are in the experimental group, to prevent bias.

Confounding

A situation in which the effect of two variables on a third is not clearly distinguishable.

Validity

The accuracy with which a study reflects the true situation.