# Physics

A rock is thrown vertically upward from ground level at time t=0. At time t=1.3s it passes the top of the tall tower, and 1.1s later it reaches its maximum height. What is the height of the tower?

1. 👍 0
2. 👎 0
3. 👁 62
1. The total time T to reach maximum height (where the velocity is zero) is 2.4 s. Use that fact to get the initial velocity Vo.
Vo = g T
Vo = 23.5 m/s

The height of the rock at any time t is
Y = Vo t - (1/2) gt^2
Knowing Vo and that Y = H (height) at t=1.3 s, you can solve for H

1. 👍 0
2. 👎 0
posted by drwls
2. k tnk u so much....u r ALWAYS a big help...:)

1. 👍 0
2. 👎 0
posted by Mary
3. You're welcome Mary! I appreciate your taking the time to say so.

1. 👍 0
2. 👎 0
posted by drwls

## Similar Questions

1. ### Physics

A rock is thrown vertically upward with a speed of 11.0 m/s from the roof of a building that is 70.0 m above the ground. Assume free fall. In how many seconds after being thrown does the rock strike the ground? GOT THIS!!!!

asked by Josh on September 11, 2006
2. ### physics

A rock is thrown vertically upward from the ground with an initial speed 15m/s. a. how high does go? b. how much time is required for the rock to reach its maximum height? c. what is the rock's height at t=2.00s?

asked by mehari on September 12, 2011
3. ### physics

A rock is thrown vertically upward from the ground with an initial speed 15m/s. a. how high does go? b. how much time is required for the rock to reach its maximum height? c. what is the rock's height at t=2.00s?

asked by mehari on September 12, 2011
4. ### Algebra 2

if an object is thrown vertically upward with an initial velocity of v from an original position of s, the height h at any time t is given by: h=-16t^2+vt+s (where h and s are in ft t is in seconds and v is in ft/sec) If a rock is

asked by Bri on April 23, 2014
5. ### Physics

A rock is thrown vertically upward with a speed of 12.0 from the roof of a building that is 40.0 above the ground. Assume free fall. In how many seconds after being thrown does the rock strike the ground? What is the speed of the

asked by Morgan on September 19, 2006
6. ### Physics

A rock is thrown directly upward from the edge of a flat roof of a building that is 56.3 meters tall. The rock misses the building on its way down, and is observed to strike the ground 4.00 seconds after being thrown. Take the

asked by Alex on May 27, 2014
7. ### PHYSICS

A rock is thrown vertically upward with a speed of 14.0m/s from the roof of a building that is 70.0m above the ground. Assume free fall. In how many seconds after being thrown does the rock strike the ground? What is the speed of

asked by Anonymous on April 3, 2014
8. ### physics

A rock is thrown vertically upward with a speed of 14.0 m/s from the roof of a building that is 50.0 m above the ground. Assume free fall. In how many seconds after being thrown does the rock strike the ground? in s What is the

asked by student on September 5, 2011
9. ### physic

A rock is thrown upward from the level ground in such a way that the maximum height of its flight is equal to its horizontal range R. (a) At what angle is the rock thrown? (b) Would your answer to part (a) be different if the rock

asked by giz on October 1, 2015
10. ### Physics

A rock is thrown vertically upward with a speed of 11.0 from the roof of a building that is 70.0 above the ground. Assume free fall. In how many seconds after being thrown does the rock strike the ground? What is the speed of the

asked by JC on September 10, 2006

More Similar Questions