Beregning af kuglens hastighed

der finder en energiomsætning sted

                                            E_pot    →  E_kin

                                            m·g·h = (1/2)·m·v_bord²      

                                            g·h = (1/2)·v_bord²   og  v_bord > 0

                                            v_bord = (2·g·h)^½  = (2·(9,82 m/s²)·(0,8 m))^½