Acceleration Due to Earth's Gravity Is -9

Acceleration due to Earth's gravity is -9.8 m/s². Which part of this number gives the information on direction, making it a vector quantity?

A) We know it is a vector quantity because the seconds are squared in the units.
B) We know it is a vector quantity because the negative sign tells us the magnitude of the acceleration.
C) We know it is a vector quantity because the negative sign tells us the acceleration is upward.
D) We know it is a vector quantity because the negative sign tells us the acceleration is downward.

Correct Answer:

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