program esfera
implicit none
integer :: i, nc
real :: xi, xf, tp, V, t, n, k, dVdt
xi=0.0
xf=5.0
tp=0.1
V=0.0
t=xi
n=2.0
k=0.0005
nc=20
print*,t,V
do i=1,nc
dVdt=9.81-9.81*k*(V**n)
V=V+tp*dVdt
t=t+tp
Print *, t, V
enddo
end program esfera
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