When the velocity of body is variable, then
Its speed may be constant
Its acceleration may be constant
Its average acceleration may be constant
All of these
Two bodies $A$ and $B$ start from rest from the same point with a uniform acceleration of $2\,m / s ^2$. If $B$ starts one second later, then the two bodies are separated, at the end of the next second, by $.............\,m$
A particle starting from rest and moves with constant acceleration travels a distance $x$ in first $2$ seconds and a distance $y$ in next two seconds, then