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?
- ASpeed is a scalar quantity; Velocity is a vector quantity.
- BSpeed is the rate of change of distance; Velocity is the rate of change of displacement.
- CUniform velocity: When a body covers equal displacements in equal intervals of time in a fixed direction.
- DVariable velocity: When a body covers unequal displacements in equal intervals of time or changes its direction of motion.
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