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9. Find a series solution for the differential equation m dv/dt + ko = c/t, where c is a constant, representing a damped motion under the action of an external force that decreases inversely proportionally to the time, the series having the form v = 21/t + az/t+ Show that this series is divergent for all values Show that the differential equation is formally satisfied by the expression et Det 7 dt. This solution is convergent for t negative. The integral el of t. Lode is known as the “exponential integral function,” and is important in physics and mathematics. It is frequently calculated by using the above divergent series. Explain how this procedure might be valid.