MATLAB: Physics Quıestion in Matlab

physics

As you can see question in below.I wrote this code but matlab gives some error.What can I do?
if true
  function [outputArg1,outputArg2] = untitled2(inputArg1,inputArg2)
F=3;
x=1;
k=-F/x;
k
x(0)=1;
Dx(0)=-0.5;
x(t)=c1*sin(sqrt(k/m)*t)+c2*cos(sqrt(k/m));
end

Best Answer

Learn how to use Symbolic Toolbox first. Here is one approach:
F=3;m=4;x0=1;
%%1st
k=F/x0;
%%2nd-3rd
syms x(t)
eq=m*diff(x,t,2)==-k*x;
Dx=diff(x,t);
x=dsolve(eq,[x(0)==1 Dx(0)==0.5])
%4th
t=subs(t,0:0.01:2);
x=subs(x,t);
plot(t,x)
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