Why is the following situation impossible? A normally proportioned adult walks b

Question

Why is the following situation impossible? A normally proportioned adult walks briskly along a straight line in the +x direction, standing straight up and holding his right arm vertical and next to his body so that the arm does not swing. His right hand holds a ball at his side a distance h above the floor. When the ball passes above a point marked as x=0 on the horizontal floor, he opens his fingers to release the ball from rest relative to his hand. The ball strikes the ground for the first time at position x=7.00h.

Explanation / Answer

yes, possible, given he and the ball had in initial velocity.

Time it takes to fall h meters:
h=1/2 g t^2

t=sqrt (2h/g)

velocity intial= distance/time= 7h/sqrt(2h/g)=

velocity initial= 1/sqrt(2/hg)

so if h initial= 1meter, then velocity
is 7/sqrt(1/4.9)= 7sqrt(4.9)= about 15m/s which is a really brisk walk. I cant run half that fast. Situation not possible....

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