Teleso o hmotnosti 20 kg premiestnime rovnomerným pohybom do vzdialenosti 5 m tak, že ťahová sila zviera so smerom posunutia uhol 30(.
Akú prácu pri tom vykonáme, ak trenie medzi telesom a podložkou je nulové? Nakresli obrázok !
Akú veľkosť má sila, ktorá koná prácu?
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