(Originais Teachy 2023) - Question Hard of Physics

A simple pendulum consists of a mass M attached to a string of length L and negligible mass. The pendulum is moved away from its equilibrium position and released to oscillate. During one of the oscillations, a student records that the mass reaches its highest point, which is 0.4 meters above the equilibrium position. Considering the acceleration due to gravity as 9.8 m/s² and neglecting energy losses due to friction, calculate the period of the motion. Additionally, determine the tension in the string at the highest point of the oscillation. Consider sin(θ) ≈ θ for small angles, where θ is measured in radians.