List two differences in tabular form between speed and velocity. When is a body said to have: $(a)$ uniform velocity and $(b)$ variable velocity? How is the average velocity of a body calculated when its velocity changes at a non-uniform rate?

  • A
    Speed is a scalar quantity; Velocity is a vector quantity.
  • B
    Speed is the rate of change of distance; Velocity is the rate of change of displacement.
  • C
    Uniform velocity: When a body covers equal displacements in equal intervals of time in a fixed direction.
  • D
    Variable velocity: When a body covers unequal displacements in equal intervals of time or changes its direction of motion.

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