If the displacement of a body is proportional to the time elapsed, what type of motion does the body possess ?

A cyclist goes once around a circular track of diameter $105$ metre in $5$ minutes. Calculate his speed.

If the acceleration of the particle is constant in magnitude but not in direction, what type of path does the particle follow ?

The speed$-$time graph of a body is a straiaht line parallel to time axis. The body has

An object is dropped from rest at a height of $150\, m$ and simultaneously another object is dropped from rest at a height $100 \,m$. What is the difference in their heights after $2\,\sec $ if both the objects drop with same accelerations ? How does the difference in heights vary with time ?