give me notes of motion class 9
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when a body changes its position with time then it is said to be in motion . Distance travelled means how much distance the object has travelled .Displacement - the distance travelled by an object from the initial position to the final position is called displacement.yes zero displacement is possible if an object has moved through a distance suppose a bus starts moving from point a and IT returns back at the same point a then the distance will be equal to 20 metres well displacement will be zero speed is the distance travelled by an object in unity interval of time its unit is metre per second what is velocity velocity is the distance travelled by an object in a definite direction in unit interval of time does the velocity of an object is displacement per unit time is unit is metre per second.
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