A student attaches a block to a vertical spring so that the block-spring system will oscillate if the block-spring system is released from rest at a vertical position that is not the system's equilibrium position. Which of the following measuring tools, when used together, can be used to determine the spring constant of the spring? Select two answers.
a. Stopwatch and ruler
b. Force sensor and motion sensor
c. Meter stick and balance
d. Push/pull spring scale and ruler
