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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?
Akú prácu vykonal žeriav, ak zdvihol betónový panel s hmotnosťou 150kg z výšky h0= 1m do výšky h1= 5,5m?
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