Solve for Velocity & Force in Jump from Roof | Physics Dynamics Help

In summary, a person with a mass of 45 kg jumps from a 4.5m high roof and bends their knees upon impact to decelerate over a distance of 0.7m. To find (a) their velocity just before their feet strike the ground, the equation v = 9.4 can be used. To find (b) the average force exerted on their torso by their legs during acceleration, the deceleration needs to be found using the same equation and then F = ma can be used to calculate the force.
  • #1
mmg0789
39
0
A person jumps from the roof of a house 4.5m high. when he strikes the ground below, he bends his knees so that his torso decelerates over an approximate distance of .7m. if the mass of his torso (excluding legs) is 45 kg, find (a) his velocity just before his feet strike the ground, and (b) the average force exerted on his torso by his legs during acceleration

...i figured out (a) v=9.4, but on b, i don't know what to do

Thanks in advance
 
Last edited:
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  • #2
You need to find the deceleration, which you can as you know the initial and final velocities, and the distance the deceleration takes place in. You need the same equation as you used in the first part, rearrange it and solve for acceleration. Then use F=ma.
 
  • #3
Since when is dynamics morbid?
 

Related to Solve for Velocity & Force in Jump from Roof | Physics Dynamics Help

1. What is physics dynamics?

Physics dynamics is the study of motion and the forces that cause or affect that motion. It is a branch of physics that deals with how objects move and interact with each other.

2. How can I improve my understanding of physics dynamics?

One way to improve your understanding of physics dynamics is to practice solving problems and equations. You can also read textbooks and attend lectures or online courses to gain a deeper understanding of the concepts.

3. What are some common applications of physics dynamics?

Physics dynamics has many real-world applications, including understanding the movement of objects in space, designing vehicles and structures, predicting the behavior of fluids, and studying the motion of particles in quantum mechanics.

4. What are some key principles in physics dynamics?

Some key principles in physics dynamics include Newton's Laws of Motion, conservation of energy, and conservation of momentum. These principles help explain how objects move and how forces affect them.

5. What are some useful tools for studying physics dynamics?

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