Force question

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The position of a 2.75 \times 10^{5} \, {\rm N} training helicopter under test is given by\vec{r} = (0.020 \;{\rm m}/{\rm s}^{3})t^{3} \; \hat{ i } + (2.2 \;{\rm m}/{\rm s})t \; \hat{ j } - (0.060 \;{\rm m}/{\rm s}^{2})t^{2} \; \hat{k}.
Find the net force on the helicopter att =5.0 s.  (Express the vector F_vec in the form F_x, F_y, F_z, where the x, y, and z components are separated bycommas.)
So to find the force, you have to integrate  twice to get acceleration:
Then I plug in 5 s into it
Then to find the force for each component,
But when I enter it into the program, it says I'm wrong. I'm not sure what I'm doing wrong and would appreciate any help,thanks.

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