This problem involves one-dimensional horizontal motion. Don't worry about any vertical forces (like the force of Earth's gravity) in your calculations. I'll say the motion is along the x axis.
The mass of an object is 1.73kg. Its position x as a function of time is given by
x = (3.45 m/s^2)t^2 + (2.22 m/s^5)t^5
Determine the net force (along the x axis) acting on the object at t = 1.33s. Give your answer to at least 3 sig figs.