Chapter 7

NCERT
Class 9
Science
Solutions
1. Distinguish between speed and velocity.

Question:

Distinguish between speed and velocity.

Answer:

Speed Velocity
(i) The rate of change of distance is
called speed
(i) The rate of change of displacement is
called velocity.
(ii) Speed is a scalar quantity (ii) Velocity is a vector quantity
(iii) Speed of a moving object is not
zero
(iii) The velocity of a moving object can
be zero.
(iv) Change in distance cause difference
in speed.
(iv) Change in velocity can be caused by
a change in magnitude or direction of
displacement

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