Posted by jamie on Saturday, March 24, 2012 at 9:47pm.
A high jumper wants to clear the bar at 2.1m. To do so he needs to raise his center of mass to a height of 2.4m. Assuming that air resistance can be neglected and his center of mass is 1.1m above the ground at takeoff, determine the required vertical takeoff speed.

physics  Elena, Sunday, March 25, 2012 at 3:25am
The jumper has to raise his center of
mass to the height of 2.4, i.e. to move
it by the distance of 2.4 1.1 =1.3 m
From kinematics
h =Vo•tg•t^2/2,
0=Vo –gt
Vo=sqrt(2•g•h) =sqrt (2•9.8•1.3) =5.05 m/s
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