How far does his center of mass move up

[chevyboy86]

Dave Johnson, the bronze medallist at the 1992 Olympic decathalon in Barcelona, leaves the ground at the high jump with vertical velocity component 6 m/s. How far does his center of mass move up as he makes the jump?

I've got nothing for info how do I solve this?

 

[arildno]

Think conversion of kinetic energy into potential energy!