A workman drops a wrench from the roof of a tall building (90 + XY) m above the street and at the same instant shouts a warning to men below. If sound travels 342 m/s, how long after the warning is heard below does the wrench strike?

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Design of structures using FEA

An arrangement, in which various members are interconnected with their constrained relative motion, the whole arrangement is then known as a structure. The degree of freedom of such a structure is zero. In such a structure, the load can act throughout the length of the structure or at the joints.