A community for students.
Here's the question you clicked on:
 0 viewing
anonymous
 4 years ago
A rock dropped from a cliff covers onethird of its total distance to the ground in the last second of its fall. Air resistance is negligible. How high is the cliff?
anonymous
 4 years ago
A rock dropped from a cliff covers onethird of its total distance to the ground in the last second of its fall. Air resistance is negligible. How high is the cliff?

This Question is Closed

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0@experimentX @shubhamsrg @JFraser

JFraser
 4 years ago
Best ResponseYou've already chosen the best response.0this is already in the physics group

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Can u Check My answer i got h = 148.48 m

experimentX
 4 years ago
Best ResponseYou've already chosen the best response.1s = 1/2 gt^2  v = 0 + g(t1) now u = v then, 1/3 s = v(1) + 1/2 g(1)^2 s = 1/2 gt^2  from these two solve or 's' and 't' rest should be okay

AravindG
 4 years ago
Best ResponseYou've already chosen the best response.0nicely explained @experimentX

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Ok....i Did by this way: h = 1/2 g t^2 Dn = u + a/2 (2n1) h/3 = a/2(2t1).....?

shubhamsrg
 4 years ago
Best ResponseYou've already chosen the best response.2in the formula you used @Yahoo! 'n' is the nth second, in your case, n= t1 .. you already know h= 1/2 gt^2 also h/3 =g/2 (2t 3) taking g=10, i get h=45..someone please confirm ?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0But why Do we take t1

shubhamsrg
 4 years ago
Best ResponseYou've already chosen the best response.2last second right ? after t seconds are complete , the object doesnt travel further..

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0I am Silly....u r correct...i got it now....

shubhamsrg
 4 years ago
Best ResponseYou've already chosen the best response.2i may be wrong in logic though.. let someone else make any correction if its there..

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0I think ur Logic is Correct...

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0But Lets Confirm..as u told..@sauravshakya

shubhamsrg
 4 years ago
Best ResponseYou've already chosen the best response.2maybe not tagged correctly..allow me @sauravshakya

shubhamsrg
 4 years ago
Best ResponseYou've already chosen the best response.2you got 148 right? by another plausible method, i am also getting 148, so that should be right,,my logic is thus, flawed//hmm..

shubhamsrg
 4 years ago
Best ResponseYou've already chosen the best response.2here is what i did,, we h = 1/2 g t1 ^2 ....(1) where t1 is total time taken . let t2 be time before it comes to last second of the journey, thus t1  t2 =1 => t2 = t1 1....(2) we know h h/3 = 1/2 g t2 ^2 2h/3 = 1/2 g t2 ^2 ...(3) using 1,2,and 3 eqns, we can solve for h, t1 and t2 .. by taking g=10, i approximately get h=148.4 something.. which should be the ans.. unless ofcorse,,there is some flaw in this also! :

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0This one looks correct

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0But This one Luks Similar to 1st One @shubhamsrg
Ask your own question
Sign UpFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.