a) v² = 2gh = 2·9,8·10 = 196 v = 14m/s
b) -- la inaltimea h corpul are doar energie potentiala Ep = mgh
-- in cadere energia potentiala se transforma (treptat) in energie cinetica
-- la o anumita inaltime h1 Ep1 = Ec
Ec = Δ Ep = mg(h - h1) Ep1 = mgh1
mgh - mgh1 = mgh1 h - h1 = h1 h1 = h/2 = 5m