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CBSE Class 9 Answered

what is velocity and what is magnitude ?
Asked by soni.nadia80 | 27 Aug, 2014, 05:28: PM
answered-by-expert Expert Answer
1.Speed of a moving object tells us how fast that object is moving but it does not tell us about the direction in which the object is moving.
To get an idea about the exact position of the moving object we need to know the direction of motion also (i.e both speed and direction ).
The velocity of the moving body implies both its speed and direction of motion.
 
Velocity of a body is the distance travelled by the body per unit time in a given direction.
 
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Distance travelled in a given direction is known as displacement and hence we can write velocity=Displacement / Time taken.
 
2.Magnitude means the relative size of the quantity i.e  just the measurement or the value without direction. 
Speed has only magnitude but no specific direction whereas velocity has both magnitude and direction.
Eg: Speed of a car is 25 km/hr.
It is just the magnitude i.e 25 km/hr ( just the size or value indicating how fast the car is travelling ).
On the other hand 25 km/hr towards north indicates the velocity of the car (with both magnitude (25 km/hr ) and direction(north) ).
Answered by Jyothi Nair | 28 Aug, 2014, 08:52: AM
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