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MathGroup Archive 2004

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DSOLVE in 5.01 ??

  • To: mathgroup at smc.vnet.net
  • Subject: [mg47497] DSOLVE in 5.01 ??
  • From: turbo cyx <turbocyx at gmx.net>
  • Date: Wed, 14 Apr 2004 07:16:54 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Hi
The following sequnece worked fine in all Mathematica versions including 4.2

dgl1 =  m g  -  c v[t]^2 ==  m v'[t]
dgl2 = s'[t] == -v[t]
DSolve[{dgl1, dgl2, s[0] == h0,v[0] == 0}, {s[t], v[t]}, t]

But since 5.0 (and now in 5.01) there are only a error messages ? 
Whats wrong here, why can't 5.01  solve this thing when 4.2 can???
OTOH: DSolve without the boundary conditions works fine (DSolve[{dgl1,
dgl2}, {s[t], v[t]}, t]), and calculationg the Constants C[1], C[2] by
"hand" (i.e. with Solve) also...
Thanks for help
Cyx


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