Using Physics to explain the motion of Olympic Divers

[greedygnome]

Homework Statement

How does physics explain diving in Olympics? Assume that a diver performs 3 different jumps, at same initial speed from a platform of 10 m. (straight into water, one spin, two spins). What is the time difference in reaching the water surface?

Relevant Equations

Kinematic, Angular, Momentum

I have a feeling that they will reach the water surface in the same time. How do I explain this in physics?

 

[PeroK]

Are you assuming the diver jumps up from the board with the same vertical speed in each case?

How would you define the vertical speed of a diver? Hint: speed of head, feet or something else?