import sympy as sp
from IPython.display import display

v,a,t = sp.symbols('v a t',real=True)
x = sp.Function('x')(t)
eq1 = sp.Eq(sp.diff(x,t,2),a)
display(eq1)
display(sp.dsolve(eq1))
display(sp.dsolve(eq1,ics={x.subs(t,0):0,
        sp.diff(x,t,1).subs(t,0):v}))