بنات الجاامعه اللي ياخذون فيزيكس 1

ابا حد يحل هالسؤال ماعرفته اف
A 72.0 kg swimmer jumps into the old swimming hole from a divingboard 3.25m above the water. Use energy conservation to find hisspeed just as he hits the water
(a) if he just holds his nose and drops in,
(b) if he bravely jumps straight up (but just beyond the board!) at2.50m/s and
(c) if he manages to jump downward at 2.50m/s