In which of the following cases of motion,are the distance moved and the magnitude of displacement equal?

$A$ body can have zero average velocity but not zero average speed. Justify this statement by giving an example.

$A$ motor bike running at $5\, m s^{-1}$,picks up a velocity of $30\, m s^{-1}$ in $5\, s$. Calculate $(i)$ acceleration $(ii)$ distance covered during acceleration.

Draw a diagram to show the motion of a body whose speed remains constant but velocity continuously changes.

Draw the distance$-$time graph for the following situations:
$(a)$ When a body is stationary.
$(b)$ When a body is moving with a uniform speed.
$(c)$ When a body is moving with non$-$uniform speed.

An electron moving with a velocity of $5 \times 10^{4} \, ms^{-1}$ enters into a uniform electric field and acquires a uniform acceleration of $10^{4} \, ms^{-2}$ in the direction of its initial motion.
$(i)$ Calculate the time in which the electron would acquire a velocity double of its initial velocity.
$(ii)$ How much distance the electron would cover in this time?