Question

If an air-track glider that is attached to a spring, pulled 20 cm to the right and released at t=0, what is the period of oscillation if it makes 15 oscillations in 10 seconds

Answer 1

By definition, period is the time required to make one oscillation. Thus, if it makes 15 oscillations in 10 seconds, it will make one oscillation in:

$$T = \dfrac{10s}{15}\approx 0.67s$$

Answer. 0.67s.