Oceľová guľôčka hmotnosti 10 g, je zavesená na ten-
kom vlákne dĺžky 50 cm na pevnom závese. Po vy-
chýlení guľôčky do výšky 6,7 cm nad rovnovážnu po-
lohu a uvoľnení sa začne kývať.
Určte:
1. Celkovú mechanickú energiu sústavy guľôčka-Zem.
2. Veľkosť rýchlosti guľôčky pri prechode rovnováž-
nou polohou.
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