The y component of a vector defined as 12.2 m at -31.9° will be the negative 6.45 m. Then the correct option is A.
What is a vector?
The quantity which has magnitude, direction and follows the law of vector addition is called a vector.
Then the y component of a vector defined as 12.2 m at -31.9° will be
y = 12.2 x sin (-31.9°)
y = 12.2 x (-0.528)
y = -6.4469 ≈ -6.45 m
Then the correct option is A.
More about the vector link is given below.
https://brainly.com/question/13188123
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