||'''Book'''|| Advanced Engineering Mathematics ||
 ||'''Author'''|| Erwin Kreyszig ||
 ||'''Edition'''|| 8th Edition ||

/* code_begins */

{{{
t=var('t')
Y=function('Y',t)
DE = 2*diff(diff(Y,t),t) + 20000*Y 
d(t)=desolve (DE,[Y,t])
d1(t)=diff(d(t),t)
k1,k2=var('k1,k2')
solve([d(0)==0,
       d1(0)==55],k1,k2)
d=d1(t).subs(k1 =(11/20), k2 =0)
print d  
}}}

/* code_ends */

 * '''Solution by''': 
   * Hardik Gajera,  student,  IISER Pune
   * Lokesh Pimpale,  student,  IISER Pune