A specimen of unknown material with square cross section of dimension 0.4 mm and has a notch of depth 0.08 mm, were impacted by hammer (15 kg) of brook's pendulum tester which rotates and falls from a high of 80 cm to 60 cm .if the result was exactly as in the figure below: Determine: (110 100. 120 15 130 17.5 10 Les Joule a) The resistance of material to impact load? b) Impact energy (practically)? c) Impact energy (theoretically)? d) Decide whether the material is brittle or ductile? 10 15 olun 5 Vo 0.08mm 10.4mm