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You need to know its direction. Put that togetherwith the speed, and you'll have the velocity.
Velocity= a speed and a direction The speed is 15 km/hr You still need a direction to make a velocity.
Tropical storm
The interval between the wars was often brief, usually simply a period of rearmament. The interval between a lightning flash and the sound of thunder can provide an estimate of a storm's distance from the observer.
Thunderstorm.