professor only?

Question

how many feet or how high does a human legs withstand an impact if you are going to jump?

Answer 1

Wel it depends. Before you read waht I have wrote chek the first two sites below.
Let us look at at the impact on the bones as one jumps and lands on the one’s legs.
1.First is impacted are bones of a foot and the phalanges, metatarsals and then cuboid, calcaneus and talus bear the impact. http://www.allaboutarthritis.com/image/stock_image/ankle_bones_MMG.jpg
2. Then the bulk of the force is transmitted to the tibia.
3. Tibia through the knee joint will transfer the force to the femur winch is the strongest bone in ones body.

Analysis
The impulse force is F=ma=
=m(change in velocity)/(time interval during which the velocity have changed)=
=m(delta v)/(delta t)
Where F – force,
m - mass of the object,
a – acceleration,
v- velocity, and
t – time.

The trick is to distribute the force of impact over a larger period of time. This is why the one is instructed to land after a jump with legs bent and slight roll. This will dissipate the force of impact over a larger area.

The areas prone to injury are ligaments/connective tissue as they may bear the initial shock, the pelvic bone and the hip joint.

Comparative computation can be made by employing a free fall equation

h=(gt^2)/2 where h- height, t-time, v -speed and g – gravitational acceleration.
The velocity at the impact will be v=gt.
We would have to conduct actual experiment (see http://dropball.cs.emporia.edu/dropballpages/About/detailedinstructions.html) to determine the actual time of impact. A good guess however is delta t = (20-30ms) and v=delta v. Do the calculation and make sure you stay in the same system (do not mix pounds and kgs).

Have fun.

Answer 2

depends on how strong the human is, and if they know how to fall. People like paratroopers and stuntmen are trained to fall in ways that cause the least amount of injury usually by letting themselves collapse so there is less tension on the body.

Highest Fall Survived Without A Parachute
Vesna Vulovic, a flight attendant from Yugoslavia, survived a fall from 10,160 m (33,330 ft) when the DC-9 airplane she was traveling in blew up over Czechoslovakia (now Czech Republic), on January 26, 1972. A terrorist bomb was thought to be the cause, and no other passengers survived. Vesna broke both legs and was temporarily paralyzed from the waist down.

Answer 3

depends on the strength of the legs, balance, will of the person to jump. i've seen people jump from the 2nd floor of a building and escaped with a few scratches.

Answer 4

Its all relative to the size hight and weight and age of a human.
if we compared a 90 years old woman jumping it may be the twenty year old that would break his leg.
I dont know if professors only are more susceptive.

Answer 5

you would need to know relative strength of legs, how heavy the person was....

need more info..

but ive seen peoplejump off bridges that were 200 feet tall or so and survive.... with multiple injuries..