• Support PF! Buy your school textbooks, materials and every day products Here!

Problem of objects falling from a height

  • Thread starter Spensy
  • Start date
  • #1
3
0
A stone falls from the high bridge and reaches the ground in 10 sec, then height of bridge is approximately __________
(a) 590m
(b) 460m
(c) 500m
(d) 1000m



the object falling has an acceleration due to gravity of 9.8m/s^2 and it reaches the ground in 10 secs so the using the formula. S= vit+1/2at^2
where vi = to zero , a=9.8m/s^2 and time t = 10secs

S = 0*10+1/2(9.8)(10)^2
S = 4.9*100
S = 490
S = 500m approximately.

Am i Correct ?
 

Answers and Replies

  • #2
Doc Al
Mentor
44,906
1,169
Last edited by a moderator:
  • #3
height = 0.5 times acceleration times (time to the power 2) since initial velocity =0
 
  • #4
Doc Al
Mentor
44,906
1,169
height = 0.5 times acceleration times (time to the power 2) since initial velocity =0
I think the OP is aware of this--since that very formula was shown in the first post.
 

Related Threads on Problem of objects falling from a height

Replies
7
Views
585
Replies
1
Views
488
  • Last Post
Replies
11
Views
15K
  • Last Post
Replies
13
Views
1K
Replies
7
Views
2K
  • Last Post
Replies
0
Views
248
  • Last Post
Replies
0
Views
244
  • Last Post
Replies
0
Views
269
Replies
2
Views
2K
Replies
3
Views
4K
Top