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In the given figure a string of linear m...

In the given figure a string of linear mass density `3xx10^(-2)` kg//m and length `L=1` m, is stretched by a froce `F=(3-kt)N`, where k is a constant and t is time in sec. At the time `t=0`, a pulse is generated at the end P of the string Find the value of k (in N//s) if the value of force becomes zero as the pulse reaches point Q.

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