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 Homework Statement:

Before the rocket launch, the pendulum suspended in the cockpit made vibrations with the oscillation period of 2 s. During the vertical launch of the rocket, it was noticed that the pendulum made 5 oscillations in 6 s. Calculate the acceleration of the rocket. g = 10m / s2
The maximum kinetic energy of a harmonically vibrating body is 10mJ. Calculate its kinetic energy when the pendulum deflection is A / 3, where A  vibration amplitude
A stone was released into the shaft, which hit the bottom with a velocity of v = 40 m / s2. Assuming that the stone falls with the acceleration due to gravity g = 10 m / s2 and the voice velocity in the air is 340 m / s, calculate the time after which we will hear the stone knock against the bottom of the shaft.
 Relevant Equations:
 Associate with simple harmonic motion and waves.
Solutions in a file.