How high is this building?

  • Thread starter Medgirl314
  • Start date
  • #1
561
2

Homework Statement


A stone dropped from the top of a building hits the ground in 2.9 s. How high is the building?

a=9.8 m/s^2
yinitial=0
vinital=0
y=?

Homework Equations


y=1/2at^2



The Attempt at a Solution


y=1/2at^2

Plugging in what I know:
y=1/2(9.8m/s^2)(2.9s)^2
Simplifying:y=1/2(82.4) m
Answer: y=41.2 m

Is this correct? Thanks in advance for confirming! :-)
 

Answers and Replies

  • #2
185
4
Looks correct to me. That is, assuming it is dropped from rest. It doesn't explicitly say, but I think it this case it is a safe assumption.
 
  • #3
561
2
Thank you! I believe it is, my physics teacher usually assumes so.
 

Related Threads on How high is this building?

  • Last Post
Replies
1
Views
6K
  • Last Post
Replies
9
Views
2K
Replies
3
Views
1K
  • Last Post
Replies
6
Views
15K
Replies
4
Views
1K
Replies
12
Views
3K
Replies
22
Views
13K
  • Last Post
Replies
2
Views
1K
  • Last Post
Replies
1
Views
1K
Replies
1
Views
8K
Top