An Object Is Shot from the Back of a Railroad

question 15

Multiple Choice

An object is shot from the back of a railroad flatcar moving at 40 km/h on a straight horizontal road. The launcher is aimed upward, perpendicular to the bed of the flatcar. The object falls:

• A) in front of the flatcar
• B) behind the flatcar
• C) on the truck
• D) either behind or in front of the flatcar, depending on the initial speed of the object
• E) to the side of the flatcar

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Definitions:

Anti-B Antibodies

Specific proteins found in the blood plasma that target and bind to the B antigen on red blood cells.

Anti-A Antibodies

Proteins produced by the immune system that specifically target and bind to antigen A on the surface of red blood cells.

Electrolytes

Minerals in body fluids that carry an electric charge, important for hydration, blood pH, and nerve and muscle function.

Hormones

Chemical messengers produced by glands that regulate physiological and behavioral activities.