may i know how to solve it?thanks you

2. (a) Sketch a "Stress - Strain curve" for a metal undergoing tensile strain testing with proper labelling of the major key points. (10 marks) (b) A solid block of timber strut of density 850 kg/m and volume 0.6 m3 floats in a liquid of density 1250 kg/m3. i. What is the mass of the block? ii. What is the weight of liquid displaced by the block? Find the volume of the timber strut that is submerged below the surface of the liquid. iv. Find the minimum force required to keep the block totally submerged in the liquid. (25 marks)