ODE45 returns NaN
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I wrote this code to plot the solution of an EDO, but MATLAB just returns NaN values. I can't find my mistake, can anyone help me?
tspan = [0 100];
v0 = 0;
[t,v] = ode45(@(t,v)(4800./(2200.*(1-0.8.^(t./40)))- 9.81),tspan,v0)