A community for students.
Here's the question you clicked on:
 0 viewing
amistre64
 3 years ago
Worst worded question to date:
A brick is thrown upward from the top of a building at an angle of 25degrees to the horizontal and with an initial velocity of 15m/s. If the brick is in flight for 3 seconds, how tall is the building?
amistre64
 3 years ago
Worst worded question to date: A brick is thrown upward from the top of a building at an angle of 25degrees to the horizontal and with an initial velocity of 15m/s. If the brick is in flight for 3 seconds, how tall is the building?

This Question is Closed

amistre64
 3 years ago
Best ResponseYou've already chosen the best response.0It took me a little bit to assume that the 3 seconds in flight was a terminanting time, and not just a random interval :)

amistre64
 3 years ago
Best ResponseYou've already chosen the best response.0dw:1346854922454:dw

amistre64
 3 years ago
Best ResponseYou've already chosen the best response.0\[4.9(3)^2+15(3)sin(25^o)+h_o=0\]

ash2326
 3 years ago
Best ResponseYou've already chosen the best response.2Could I suggest something? @amistre64 sir

ash2326
 3 years ago
Best ResponseYou've already chosen the best response.2only the velocity in vertical direction is of use here \[V_v= 15 \sin 25 \] now let's find the time it takes the velocity in vertical direction to get to 0 and the distance it coversdw:1346855419638:dw let the height be h1 and time be t1 here acceleration due to gravity=10 m/s^2 in downwards direction so 10 \[vu=at\] \[0V_v=10*t_1\] we could find t_1 from here \[v^2u^2=2as\] \[0(V_V)^2=2*10*h_1\] h1 from here now the remaining time it takes to reach ground 3t1 using this we could find h2 building's height is h2h1

ash2326
 3 years ago
Best ResponseYou've already chosen the best response.2for h2 \[s=ut+1/2 at^2\] \[h_2=0\times (3t_1)+\frac 12 (10) (3t_1)^2\]

amistre64
 3 years ago
Best ResponseYou've already chosen the best response.0while i can understand the concepts you presented, it does seem like an awful lot of extra workings. I am a mathematician at heart, and by default very lazy :)
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.