What is the speed with which she lands?

Thread starter kokenwa
Start date Nov 27, 2007
Tags

Speed

AI Thread Summary

To determine the landing speed of a pole-vaulter who reaches a height of 6.0 meters, the law of conservation of energy can be applied. At the peak height, all kinetic energy is converted to potential energy, which can be calculated using the formula PE = mgh, where m is mass, g is the acceleration due to gravity, and h is height. As the vaulter falls, this potential energy converts back to kinetic energy, allowing the calculation of landing speed using KE = 0.5mv². By equating potential energy at the height to kinetic energy just before landing, the speed can be derived. The final speed upon landing is approximately 10.8 m/s.

Nov 27, 2007

kokenwa

A pole-vaulter of mass 60kg vaults to a height of 6.0m before dropping to thick padding placed below to cushion her fall. What is the speed with which she lands?

-I know it has something to do with momentum, but I don't even know where to begin on this one

Physics news on Phys.org

Nov 27, 2007

rock.freak667

Homework Helper

Consider neglecting air resistance and using the law of conservation of energy

Thread 'Errors and significant figures'

I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...

View full post »

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...

View full post »

Thread 'Explain this asphalt sheen'

This problem is two parts. The first is to determine what effects are being provided by each of the elements - 1) the window panes; 2) the asphalt surface. My answer to that is The second part of the problem is exactly why you get this affect. And one more spoiler:

View full post »