The distance$-$time graph of a body is parallel to time axis. The body is
cannot say
variable motion
in uniform motion
at rest
A motorcyclist drives from $A$ to $B$ with a uniform speed of $30\, km\, h^{-1}$ and returns back with a speed of $20 \,km \,h^{-1}$. Find its average speed(in $km\, h^{-1}$).
A car manufacturer advertises that the brakes are so perfect that the car stops instantaneously. Comment.
Write true or false for the following statements
In one$-$dimensional motion, the average velocity and the instantaneous velocity are unequal.
Write true or false for the following statements
A motion is said to be uniform, if a body undergoes equal displacements in equal intervals of time.
$(a)$ What is acceleration ? Write its $SI$ unit.
$(b)$ Draw velocity-time graph, when an object has
$(i)$ uniformly accelerated velocity
$(ii)$ uniformly retarded velocity.