A bee flies in a spiral path described by $r = 2t$ and $heta = \pi t$, where $r$ is in meters, $heta$ is in radians, and $t$ is in seconds. What is the magnitude of the bee's displacement from $t = 0$ to $t = 2$ s?

If a body travels $30m$ in an interval of $2s$ and $50m$ in the next interval of $2s$ then the acceleration of the body is

If a body travels $30m$ in an interval of $2s$ and $50m$ in the next interval of $2s$ then the acceleration of the body is