MATLAB: Stuck with one program

homeworkno attemptprogramming

Hello, well I'm new using Matlab and is really awesome. I'm stuck with this exercise. Thanks for the help(:
13)    A particle, initially at rest, is subjected to an applied force F.
   For time  t between  0 and a  Time T       F  =  Fm  (1 -  ((t – T)/T) )^2
   For  time t > T          F = Fm          
a) Write  a script (Editor) file  that requests  the values  of   Fm,  T, and t as input,  and displays the value of F.
b) Plot  F vs t    use the values of  Fm = 5,   T = 10,  t [0 – 20]
Create the  variables  xmax = 20  and  ymax = F(1)   and  controls the graph axis using the command:
    axis([0   xmax   0     ymax])
  % this command goes after the plot command
Use SI units.   
Call this program  xxx_section_F3.m  where xxx  are your initials and substitute the section word by the section number that are 08 or 22.
  Hint:   create the  t vector with linspace as example:
    t = linspace(0,  20, 200)
for  n = 1: 200;
   F(n) = …..     %  when n=1 create F(1), when n = 2 create F(2), when n = 3 create F(3) and so on.  You must use  if command  inside the for command
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