What happens when two forces at same direction

Acylindrical specimen of a nickel alloy having an elastic modulus of 207 gpa (30 × 106psi) and an original diameter of 10.2 mm (0.40 in.) experiences only elastic deformation when a tensile load of 8900 n (2000 lbf) is applied. compute the maximum length of the specimen before deformation if the maximum allowable elongation is 0.25 mm (0.010 in.)

What are two different ways you could find the value of a? explain these methods.

Which of the following are used in an electrochemical cell? a. electrodes b. electrolyte c. terminals d. all of the above