1- Which one below describes spring constant the best? a. Measure the strongness of a pendulum b. Measure the strongness of a spring c. Measure the stiffness of a pendulum d. Measure the stiffness of a spring

The correct answer is d. Measure the stiffness of a spring.<br /><br />The spring constant, often denoted by the symbol k, is a measure of the stiffness of a spring. It is defined as the force required to compress or stretch the spring by a certain distance. The greater stiffer the spring is. Therefore, option d, "Measure the stiffness of a spring," best describes the spring constant.