under what condition is the displacement of a body equal to the distance travelled by it?

The displacement of a body is equal to the distance travelled by it only if the body moves in a single straight line.

Example: Suppose a boy runs a distance of 5km in going from his home to the school in the east direction in a straight line,then

Distance travelled=Displacement=5km

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If a body travels in a straight path ten its distance and displacement becomes equal and have the same sign. 

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The displacement of a body is equal to the distance travelled by it only if the body moves in a single straight line.

Example: Suppose a boy runs a distance of 5km in going from his home to the school in the east direction in a straight line,then

Distance travelled=Displacement=5km

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IF THE BODY HAD COVERED 5KM  DISTANCEINA STRAIGHT LINE THEN THE DISPLACEMENT OF THE BODY  WOULD BE 5KM BECAUSE DISPLACEMENT=FINALPOSITION -- INITIAL POSITION 

SO THE DISPLACEMENT OF THEBODY WOULD BE  =  5 -- 0 = 5KM

I HOPE  U HVE UNDERSTOOD

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