83. From the tower height of 35 m horizontally cast stone weighing 0.3 kg. Disregarding the air resistance, to determine: 1) the rate at which the cast stone if 1 second after the beginning of the movement, the kinetic energy of 60 J: 2), the potential energy of the stone 1 second after the start of motion.

Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)