It's a matter of physics. A man is masturbating. Let the mass of the dick be m, the spring constant of the skin of the dick be k, and the natural length be l. Let μ' be the coefficient of friction between the corpus cavernosum and the penis. Please answer the following questions.
A(1) Let x be the displacement from the natural length of the penis, and set up the equation of motion.
(2) Find the maximum stretch of the dick when the man strokes the dick at the initial velocity v.
B This man ejaculates prematurely, so he ejaculates with 1856 kj of thermal energy.
(1) Find the period when you stroke your dick once as a simple harmonic motion.
(2) Find the frictional heat generated when stroking once.
(3) Find the time until ejaculation.