Answer
x = 12m
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 = 4 s we need to find x(4), or in other words, plug in 4 for t in the equation. This gives us
$ x = 3(4) - 4(4)^2 + (4)^3 = 12 - 4*16 + 64 = 12 - 64 + 64 = 12 $ Therefore x = 12m
