A Mass Of 1 Slug, When Attached To A Spring, Stretches It 2 Feet And Then Comes To Rest In The Equilibrium Position. Starting At T = 0, An External Force Equal To F(T) = 6 Sin 4t Is Applied To The System. Find The Equation Of Motion If The Surrounding Medium Offers A Damping Force That Is Numerically Equal To 8 Times The Instantaneous Velocity. (Use G = 32