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Akú veľkú mechanickú prácu vykoná Peter, ak zdvihne zo zeme tašku s hmotnosťou 6kg do výšky 1,2 metra? Gravitačné zrýchlenie je g= 10N/kg.
Pri nákupe v supermarkete tlačila pani Jana nákupný vozík stálou silou 50N. Akú mechanickú prácu vykonala, ak ho tlačila po dráhe 12 metrov.
Eliška tlačila kreslo priamočiaro z jednej izby do kuchyne stálou silou 60N. Vykonala pri tom prácu 300J. Ako ďaleko Eliška odtlačila kreslo?
Pani knihovníčka ukladala 50 kníh, každú s hmotnosťou 250g na políčku, ktorá bola vo výške 1,8 metra nad zemou. Akú prácu vykonala?
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