What does the path of an object look like when it is in uniform motion?

A motorboat starting from rest on a lake accelerates in a straight line at a constant rate of $3.0\, m s^{-2}$ for $8.0 \,s$. How far does the boat travel (in $m$) during this time ?

An object has moved through a distance. Can it have zero displacement? If yes, support your answer with an example.

A ball is gently dropped from a height of $20\, m$. If its velocity increases uniformly at the rate of $10\, m s^{-2}$, with what velocity will it strike the ground? After what time will it strike the ground ?

A train starting from a railway station and moving with uniform acceleration attains a speed $40\, km \,h^{-1}$ in $10$ minutes. Find its acceleration(in $m / s ^{2}$).