A change in rate of motion or direction?

Velocity is the rate at which the position changes. for an object to have constant velocity, speed and direction must not be changing. A change in velocity can be either a change in how fast something is moving or change in the direction of movement.

weather forecasts are done by collecting data about the current state of the atmosphere mainly the temperature, humidity and wind and using meteorology, to determine the atmosphere that evolves over time. the h and l mean the high and low pressure. the red strip is a warm front. the blue strip is a cold front. the blue and red strip is a stationary front. the purple strip is a occluded front.

explanation:

a.) travels faster in solids because the particles are closer together.

air is a gas water is a liquid