It has to be solved by using convolution theorem :
i try to separate them into 3 parts :
1/s , 1/s^2 , 1/(s-3) but failed to get the correct answer.
May i know the correct way to solve this question ?
Thank a lots for the reply.
Read this: Convolution for Laplace Transform
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If you need more help, please show what you've done and say where you get stuck.