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Question: differential equasion problem! help!

Question:differential equasion problem! help!

mrmusic1994 10 Maple
differential-equation dsolve
December 11 2017
2

HI!, 

first time post.

I am reletivly new to maple and am having some problems getting maple to solve my differential equasions

basically my equasion is -

m*dv/dt=mg-R 

v(0)=0

m is mass at 100kg, g is gravity at 9.81m/s and R is air resistence (k*v) where v is a constant yet to be determined

the constant k needs to be that which would make the terminal velocty 5m/s 

this is all i have so far and im scratching my head:

de := 100*diff(v(t),x)=100*9.81-R;
                      de := 0 = 981.00 - R
Y :=rhs(dsolve({de,v(0)=0}, v(t)));
Error, (in dsolve) not a system with respect to the unknowns [v(t)]
 

what am i doing wrong?. 
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