Determine the Laplace transforms of the initial value problem (IVP)y′′−y′−30y=9u(t−5),y(0)=0,y′(0)=0𝑦″−𝑦′−30𝑦=9𝑢(𝑡−5),𝑦(0)=0,𝑦′(0)=0and obtain an expression for Y(s)=L(y)(t)𝑌(𝑠)=𝐿(𝑦)(𝑡). Do not find the inverse Laplace transform of the resulting equation.
Question
Determine the Laplace transforms of the initial value problem (IVP)y′′−y′−30y=9u(t−5),y(0)=0,y′(0)=0𝑦″−𝑦′−30𝑦=9𝑢(𝑡−5),𝑦(0)=0,𝑦′(0)=0and obtain an expression for Y(s)=L(y)(t)𝑌(𝑠)=𝐿(𝑦)(𝑡). Do not find the inverse Laplace transform of the resulting equation.
Solution
The given initial value problem (IVP) is a second order linear differential equation with constant coefficients. The Laplace transform of the differential equation is given by:
L{y'' - y' - 30y} = L{9u(t-5)}
Taking the Laplace transform of each term separately, we get:
L{y''} - L{y'} - 30L{y} = 9L{u(t-5)}
Using the properties of Laplace transforms, we know that:
L{y''} = s^2Y(s) - sy(0) - y'(0) L{y'} = sY(s) - y(0) L{y} = Y(s) L{u(t-5)} = e^-5s/s
Substituting the initial conditions y(0) = 0 and y'(0) = 0, and the above expressions into the transformed differential equation, we get:
s^2Y(s) - 0 - 0 - sY(s) - 30Y(s) = 9e^-5s/s
Simplifying, we get:
(s^2 - s - 30)Y(s) = 9e^-5s/s
Finally, solving for Y(s), we get:
Y(s) = 9e^-5s / s(s^2 - s - 30)
This is the Laplace transform of the solution to the given initial value problem.
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