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Q4. A container of mass 2 tonnes is being lowered onto the deck of a ship. It is supported by 4 steel wires each of 12 mm diameter. The container is being lowered at a constant speed of 0.2 m/s. When the length of the wires is 30 m the brake is suddenly applied. Calculate EACH of the following:

(a) The static stress in EACH wire when supporting the weight of the container;

(b) The additional stress imposed on the wires due to the sudden stop;

(c) The maximum extension of the wires due to the sudden stop.

Note: Modulus of Elasticity for steel = 200 GN/m²