Question

1. The problem statement, all variables and given/known data

A first stone is dropped from the roof of a building. 2.40 s after that, a second stone is thrown straight down with an initial speed of 33.0 m/s, and it is observed that the two stones land at the same time.

(a) How long did it take the first stone to reach the ground?
_____________ s
(b) How high is the building?
_____________ m
(c) What are the speeds of the two stones just before they hit the ground?
_____________ m/s (first stone)
_____________ m/s (second stone)

Answer 1

Using \[s = \frac{ 1 }{ 2 } a t ^{2} + v _{o}t + h _{o}\] for each stone, the s terms will be equal to 0 when the stones hit the ground, thus the right sides may be equated. The h terms cancel, and you get a quadratic in t which can then be solved.

Remember, the dropped stone's t is 2.40 s longer than the thrown stone - don't use two variables for the times.

Answer 2

do you need only the final answer or what?

Answer 3

the final answer....:)

Answer 4

why do you smile
:(

Answer 5

cause i'm hoping that you'll give the answer? is that possible?

Answer 6

sure just order me :)

Answer 7

@K0GA wat do u mean? anyways i really have to verify.....

Answer 8

i cannt understand what you mean

Answer 9

@K0GA type your answer here

Answer 10

iam sorry but its hard to open this site on my lab

Answer 11

lets imagine that iam on the top of hospital

and i dropped first stone from my hand from rest , then after 2.4 sec i throw second stone with intial speed 33 m\s

Answer 12

(a) 5.3 sec

Answer 13

(b) 137.6 m

Answer 14

(c) 51.9 m\s ,,, 61.4 m\s