i solve a dynamic problem but i get wrong answer. F (load) after 0.02 then to zero but d (displaciment) not go to zero 

1.mw  

New_Microsoft_Excel_Worksheet1.xlsx

how can i solve coupled differential of equation with rkf or another method

maple.mw

A1 , A2, A3 ??

i want to dsolve frome this equation . but i cant

1.mw

hello. i want to write this function with  "for"loop. but i don't know
1.mw

hello. i want to write this functionT with  "for"loop. but i don't know
 

e.mw