Angular SHM and Simple Pendulum: Practice Problem & Solution

Solution Explained:

To solve this problem, we apply the core principles of Angular SHM and Simple Pendulum. Understanding the underlying formula is key to arriving at the correct answer below:

In a free-falling lift, the effective acceleration due to gravity is zero ($ g_{eff} = g - g = 0 $). Since frequency $ f = \frac{1}{2\pi}\sqrt{\frac{g_{eff}}{l}} $, the frequency becomes zero.