A particle moves along a semicircle of radius $10\,m$ in $5$ seconds. The average velocity of the particle is...........$ms^{-1}$

A particle moves along the sides $AB, BC, CD$ of a square of side $25 \,m$ with a velocity of $15$$m{s^{ - 1}}.$ Its average velocity is........$m{s^{ - 1}}$

A ball thrown up from a location, returns back at the same location. Which of the following statements are correct.

$(a)$ Distance travelled by ball can be zero
$(b)$ Displacement of ball is zero
$(c)$ Average velocity of ball is zero
$(d)$ Acceleration of the ball is zero

One car moving on a straight road covers one third of the distance with $20 \,km/hr $ and the rest with $60\, km/hr$. The average speed is..........$km/hr$

A car starts from rest and moves with uniform acceleration $'a'$ on a straight road from time $t = 0$ to $t = T$ . After that, a constant deceleration $'a'$ brings it to rest. In this process the average speed of the car is

A car is moving along a straight line, say $OP$ in given figure. It moves from $O$ to $P$ in $18\; s$ and returns from $P$ to $\mathrm{Q}$ in $6.0\; s$. What are the average velocity and average speed of the car in going from $O$ to $P$ and back to $Q?$