After a Shell Explodes at the Top of Its Trajectory,the

question 36

Multiple Choice

After a shell explodes at the top of its trajectory,the center of gravity of the fragments has an acceleration,in the absence of air resistance,

• A)of less than g downward.
• B)equal to g and downward.
• C)greater than g and downward.
• D)of g downward plus a forward component.
• E)of g downward plus a backward component.

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Definitions:

Masked Design

A research design in which participants do not know which treatment group they are in to prevent bias; also known as a blinded design.

Placebo

An inert or non-therapeutic substance given to a control group in clinical trials to assess the psychological impact of receiving a treatment.

Natural

Naturally occurring and not manufactured or created by human beings.

Biased

Showing an unfair preference or prejudice for or against something or someone.