Answer:
Independent variable: Length of the pendulum and the point of release
Dependent variable: Period
Step-by-step explanation:
The Independent variable in an experiment is defined as the variable which can be controlled or manipulated during the experiment to observe its effect on the dependent variable. While the dependent variable is the one that is experimented or tested during the experiment and observes the impact of change in the independent variable.
In the pendulum experiment, the length, as well as the point from which the pendulum, is released is the independent variable while the period will be the dependent variable as a change or manipulation in the former(length or point of release) directly affects the latter(period).