15.2.4. The material point mass M m = 0,5 kg flexible thread attached to the OM = 2 m long and with a thread performs oscillations in the vertical plane according to the equation φ = (π / 6) sin2πt. Determine the kinetic energy of a material point in its lower position.

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(Chapter 3 - Dynamics theme - 15.2: The kinetic and potential energy of a material point) of Reshebnik to the collection of short tasks on the theoretical mechanics Kep OE, JA Viba, OP Grapis, JA Svetinysh et al. Publishing Moscow / Graduate School / 1989, 2009, 2012.
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