# Physics

A 70kg man jumps 1.00 meters down onto a concrete walkway. His downward motion stops in 0.02 seconds. If he forgets to bend his knees, what force is transmitted to his leg bones?

a. 15 500N
b. 7 010N
c. 4 900N
d. 3 500N

How do you solve this

1. 👍
2. 👎
3. 👁
1. force*timestopping= mass*velocity change

v= sqrt(2*9.8*1)= sqrt(19.6)
force= 70*sqrt(19.6)/.02

1. 👍
2. 👎
👤
bobpursley

## Similar Questions

1. ### science

if a 70kg man and a 40kg boy are both running at the same velocity, who has more momentum?

2. ### physics

A person jumps off a diving board 4.6 m above the water's surface into a deep pool. The person's downward motion stops 1.6 m below the surface of the water. Estimate the average deceleration (magnitude) of the person while under

3. ### geometry

Raul is laying a cement concrete walkway in his backyard. He decides to put a turn of 30° from the horizontal in the walkway to go around a tree and flowerbed. Once he gets past the tree, he wants to continue the walkway in the

4. ### Algebra

You are planning to build a walkway that surrounds a rectangular garden that is 10ft by 9ft. The width of the walkway around the garden is unknown, but it will be the same on every side. a)what is the perimeter of the walkway

1. ### physics

figure 3.1 shows a rectangular concrete slab of weight 18000N. It rests on a brick wall and is the roof of a bus shelter. The concrete slab is 3.0 m wide. The wall is 2.5 m from the front of the concrete slab and 0.50 m from the

2. ### Physics

A bicyclist moving at a constant speed takes 10.0 seconds to travel 500 meters down a path inclined 30.0° downward from the horizontal. What is the vertical velocity of this motion?

3. ### Physics

You encounter a moving walkway that is 97 m long and has a speed of 2.0 m/s relative to the ground. How long would it take you to cover the 97 m length of the walkway if, once you get on the walkway, you immediately turn around

4. ### Physics

Projectile motion is caused by the 1. downward force of gravity and horizontal motion of velocity. 2. downward force of gravity. 3. horizontal motion of velocity. 4. vertical motion of velocity

1. ### Math

a 13 ft by 27 ft rectangular swimming pool is surrounded by a walkway of uniform width. if the total area of the walkway is 384 ft^2 how wide is the walkway

2. ### math

A walkway forms a diagonal of a square playground. The walkway is 24 meters long to the nearest tenth of a meter. How long is the side of the playground?

3. ### Physics 11

A man jumps from a great height and falls freely to the Earth. Another man jumps from the same height 1 s later. How much are the two men separated by, 2 s after the second man jumps? I'm not sure exactly how to tackle this

4. ### Math

A rectangular pool measuring 6 feet by 12 feet is surrounded by a walkway. The width of the walkway is the same on all four sides of the pool. If the total area of the walkway and pool is 520 square feet, what is the number of