Mechanical Engineering Jobs Salary Projects Software

I would really appreciate it if someone helped me through this question..
A weight W is suspended from a steel cable with a cross sectional area of 36 mm2, a length of 81m and a Young’s modulus of 200,000 N/mm2.
If the elongation of the cable due to the weight is 13 mm, determine the value of W in Newtons.
Thank you

For the career I want it is very important that I be an outstanding decision maker and quick problem solver. I already have an interest in mechanical things and was thinking of majoring in Mechanical Engineering? Will this major help me to gain these skills or would a different engineering major help more?