Posted by **Alfonso** on Saturday, September 14, 2013 at 12:00am.

Surprisingly, very few athletes can jump more than 2.7 ft (0.82 m) straight up. Use d = 1/2 gt2 and solve for the time one spends moving upward in a 0.82 m vertical jump. Then double it for the "hang-time" -- the time one's feet are off the ground.

Can you explain step by step please.

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