Solving the Egg-Throwing Problem: Seeking Help from Clair_A_Net

[clair_a_net]

K. I was given the problem:

An egg is thrown nearly vertically upward from a point near the cornice of a tall building. It just misses the cornice on the way down and passes a point a distance 50.0 m below its starting point at a time 5.00 s after it leaves the thrower's hand. Air resistance may be ignored.

And I'm trying to find: What is the initial speed of the egg?

so i used the equation Xf=Vo*t+Xo ie: 50+Vo*5+0 getting 10 m/s, but that answer is wrong.

so then i tried Xf= Xo+Vo*t+(1/2)a*t^2 ie 50=0+Vo*5+.5*9.8*5 assuming a=9.8 but that wasn't given. i got 34.5 and that was wrong too. So if anyone has any idea as to what I'm doing wrong or how to get the correct answer let me know.

thanks
clair_a_net
ps if its after 12pm tonight then the homework was already due so thanks for trying anyways. but i would still like to know what I am doing wrong.

 

[Fermat]

...

so then i tried Xf= Xo+Vo*t+(1/2)a*t^2 ie 50=0+Vo*5+.5*9.8*5 assuming a=9.8

...

You have,

50=0+Vo*5+.5*9.8*5

which I assume is just a typo (for the power of t = time) and that you actually used

50=0+Vo*5+.5*9.8*5²

this gives

50 = 5Vo + 122.5
5Vo = -72.5
Vo = -14.5 m/s
===========

 

[quicknote]

Hi Clair_a_net,

It looks like you're on the right track with your equations, but there are a few things that may be causing your incorrect answers. First, it's important to make sure your units are consistent throughout the problem. In your first equation, you have the distance as 50.0 m, but in your second equation, you have it as just 50. This may be causing a discrepancy in your calculations.

Additionally, in your second equation, you have the acceleration as 9.8. This is the acceleration due to gravity on Earth, but since air resistance is being ignored, the acceleration should be 0. This may also be contributing to your incorrect answer.

I would suggest going back to your original equation Xf=Vo*t+Xo and making sure all of your units are consistent. Also, try setting the acceleration to 0 and see if that gives you a more accurate answer. If not, there may be another factor that is missing from the problem. It's always a good idea to double check your work and make sure all of your assumptions and calculations are correct.

Hope this helps! Good luck with your assignment.