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CBSE Class 9 Answered

(a) Differentiate between distance and displacement. (b) Under what conditions is the magnitude of average velocity of an object equal to its average speed?
Asked by Topperlearning User | 13 May, 2015, 09:32: AM
answered-by-expert Expert Answer

(a)


Distance 

Displacement
  • It is the actual length travelled by an object.
  • It is the shortest distance travelled by an object between the initial and final positions, along a certain direction.
  • It is a scalar quantity, that is, it only has a magnitude.
  • It is a vector quantity, that is, it has a magnitude as well as direction.
  • For a moving object, it can never be zero.
  • For a moving object, it can be zero, positive or negative.
  • It is more than or equal to the magnitude of displacement.
  • It is less than or equal to the distance.

(b)When the body is moving along a straight line, the magnitude of average velocity is equal to its average speed.

Answered by | 13 May, 2015, 11:32: AM

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