Answer
x = 0m
Work Step by Step
The position is given by the equation $ x = 3t - 4t^2 + t^3 $ where x is in meters and t is in seconds
To find the position at t = 3 s we need to find x(3), or in other words, plug in 3 for t in the equation. This gives us
$ x = 3(3) - 4(3)^2 + (3)^3 = 9 - 4*9 + 27 = 0 $ Therefore x = 0m
