In other words, you need to know the velocity of the storm.Velocity includes the speed of an object and the direction of its motion.
Example1: For an object to have constant velocity, speed and direction must not be changing.Example2: The people on these two escalators have the same speed. However, their velocities are different because they are traveling in opposite direction.
Example3:The speed of this car might be constant but its velocity is not constant because the direction of motion is always changing.
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