Which is a vector? Displacement Distance Speed None

 A vector is an object that has both a magnitude and a direction. Geometrically, we can picture a vector as a directed line segment, whose length is the magnitude of the vector and with an arrow indicating the direction.

Explanation:

brainliest plz

The correct answer is

Displacement.

As Displacement has both magnitude and direction it is Vector.

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1 - wave length

2 - amplitude

3 - crest

4 - trough

explanation:

duh.

it doesn't. it was imagined up in the middle ages.