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Q9. A vertical steel rod welded to a heavy platform is 1.2 m long and 18 mm diameter. Twenty millimeters above the end of the rod, a mass of 100 kg becomes dislodged and falls onto the end of the rod.

Calculate EACH of the following:

(a) the instantaneous compression of the rod; (14)

(b) the instantaneous initial stress induced into the end of the rod. (2)

Note:  The Modulus of Elasticity for steel = 208 GN/m².