Accomplished ballet dancers and basketball players often appear to \"hang\" in t
ID: 1406001 • Letter: A
Question
Accomplished ballet dancers and basketball players often appear to "hang" in the air when jumping. About everyone has heard the expression "hang time". Does this really happen or is it just an illusion? One of the most accomplished leapers, Darrel Griffith, had a standing vertical jump of 4 ft that lasted a total of only 1 second.
Consider Darrel Griffith's 4 ft vertical leap and answer the following questions:
1. Does Darrel spend more time in the air while between 0 and 2 ft from the ground or while between 2 and 4 ft? Explain.
2. From the very beginning to the very end of his jump, does his head move through just 4 ft? Explain.
Explanation / Answer
1.
When darren jumps, he jumps with certain velocity which keeps decreasing as he moved upward.
So initially velocity is more so more distance can be covered in less time.
Thus we can say that 1st 0 to 2 ft can be covered in less time as compared to 2 to 4 ft which takes more time.
So, he spends more time in the air while between 2 and 4 ft
2.
His head is at certain height. When he jump, his head goes up by 4 ft and when he comes down, his head willl be back at initial position.
So, from the very begining to very end of jump, his head moved throgh 8 ft, 4ft while going up and same 4ft while coming down.