Which of the following is a scalar quantity?

Can anybody me with this? ? (picture included.)

Aspring has a natural length of 8 m. if a 12-n force is required to keep it stretched to a length of 10 m, how much work w is required to stretch it from 8 m to 16 m? (round your answer to two decimal places.)

Mechanical energy is when the amount of kinetic and potential energies added together remains the same. conserved created lost