The pendulum made 50 oscillations in 25, determine the period and frequency of oscillations of the pendulum.

The oscillation period is such a period of time during which the body returns to the same point from which it began its movement.
T = t / n, where n is the number of oscillations, t is the time during which the body made these oscillations.
Let’s define the oscillation period:
T = t / n = 25/50 = 0.5 s.
The oscillation period depends on the frequency according to the law:
T = 1 / ν
Let us express the frequency from this expression:
ν = 1 / T = 1 / 0.5 = 2 Hz.
Answer: the oscillation frequency is 2 Hz, the oscillation period is 0.5 s.