An overdamped harmonic oscillator satisfies the equation
x·· + 10x· + 16x =0.
At time t = 0 the particle is projected from the point x = 1 towards the origin with speed u. Find x in the subsequent motion. Show that the particle will reach the origin at some later time t if
(u-2)/(u-8) = e6t.
How large must u be so that the particle will pass through the origin?