Question

What is direction of motion?​

Answer 1

Answer:

The direction of motion is the direction the velocity vector points in. To take your example of a projectile fired straight up, because only it's height, z, is changing the velocity vector will look like: →v=(0,0,dzdt)

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Answer 2

Answer:

The direction of motion is the direction the velocity vector points in. To take your example of a projectile fired straight up, because only it's height, z, is changing the velocity vector will look like: →v=(0,0,dzdt)