The position $x$ of a particle with respect to time $t$ along x-axis is given by $x = 9t^2 – t^3$ where $x$ is in metres and $t$ in seconds. What will be the position of this particle when it achieves maximum speed along the + x direction ?

Question

( A ) 81 m
( B ) 32 m
( C ) 54 m
( D ) 24 m