The precipitation associated with a warm front typically arrives extensively ahead of the actual frontal boundary.
Rain transpires on the foremost fringe of a warm front. As warm air is slightly less viscous than cold air, it slowly rises over the cold air by gradual frontal lifting and permits precipitation to evolve ahead of the frontal edge.
Yet, while cool air at the surface lives forward of a warm front, relatively warmer air often is discovered above it as the warmer surface air after the front rises up and over the cool air below. If sufficient moisture is present, this can develop in precipitation along and forth of the front.
More about gradual frontal lifting :
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Answer:
I think it might be the third one... but I'm not sure.
Explanation:
I think k represents gravity because it's the string keeping the ball attached to the pole.
