A community for students.
Here's the question you clicked on:
 0 viewing
anonymous
 5 years ago
2 stones are dropped from the top of a tower at half a second apart .The time after dropping the first stone at which the distance between the 2 stones is 20 m is
a. 4 s
b. 4.25 s
i took 1 distance as x and other as 20 + x ...
how to take time ..can some1 pls help me...
anonymous
 5 years ago
2 stones are dropped from the top of a tower at half a second apart .The time after dropping the first stone at which the distance between the 2 stones is 20 m is a. 4 s b. 4.25 s i took 1 distance as x and other as 20 + x ... how to take time ..can some1 pls help me...

This Question is Closed

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Since intially the time difference was 0.5s, take the time taken by the first stone (till the instant when distance is 20) as t, then other stone takes t0.5. You could do this way or an easy method is to use the concept of the relative velocity. Using that when the second stone is dropped, the first stone has a velocity of 0.5*10=5 and is (0.5)*(10)*(0.5)^2=1.25m below first stone. After dropping the second stone, when you see the relative motion of first stone wrt the second stone, it is uniform motion without any relative acceleration (As both are in freefall) and the time taken for the distance to be 20m, the second stone should gain 18.75m more from the dropping of second stone which takes 18.75/5=3.75s. So the time from dropping of first stone turns out to be 3.75+0.5=4.25s.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0tnx a lot.. :) u're gr8 !!

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0can u pls help once more?? i dint understand 18.75/5..y did u do that?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0is that distance/velocity =time?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Yeah, it is. I could do that since it is uniform velocity motion.
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.