the problem:Suppose at time zero, the bob was drawn upward four units from the equilibrium position, let C=2, K=2, m=1 lbm, initial speed=2 unit/sec find an expression for body's position.

and in the solution it says: y''+6y'+5y=0

my question is: from where does the numbers (6) and (5) that is in te above DE came from ?

2. Relevant equationsspring equation:

my''+cy'+ky=f(t)

consider f(t) =0

3. The attempt at a solutionstopped at first because of the first step