A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • 5 years ago

pls help me... a body thrown vertically up with a speed of 10 m/s from the top of a wall of height 3.45 m. The height from which another body should be dropped simultaneously such that the two bodies reach the ground at the same time is a. 40 b. 24.5 i got t=u/g =1 s (time up) h (max) =u^2/2g=100/20=5 m so total distance down is 5 + 3.45 =8.45 then what to do?? help

  • This Question is Closed
  1. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    What you need here is the total time of flight for the first object. Since it vent up for 1s, as you correctly stated, it'll take 1s to reach the level of the top of the wall again. At that time it's velocity , will again be 10 m/s. The time needed to cover the rest of the way down is: \[3.45 = h = at^2/2+v*t\] solution to t is: \[t = (-v +\sqrt{v^2+4a*3.45})/2a=0.27\] So the total time of flight is: 1+1+0.27 = 2.27 s The height of an object, that takes this long to reach the ground is: \[h = at^2/2 = 10*2.27^2/2=25.76 m\] so neither is correct, but b is a lot closer.

  2. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    tnx a lot 4 ur help...i was stuck..

  3. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    \[2n equals 9\]

  4. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy

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
  • 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.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.