Physics

a stone is dropped from a 75m building. when a stone has dropped 15m, a second stone was thrown downward with an initial velocity such that the two stones hit the ground at the same time. what was the initial velocity of the second stone.

  1. 👍 0
  2. 👎 0
  3. 👁 715
  1. d = Vo*t + 4.9t^2 = 15,
    0 + 4.9t^2 = 15,
    t^2 = 3.06,
    t = 1.75s. = Time to fall 15m.
    Therefore, the 1st stone had a 1.75s
    headstart:

    d1 = 0 + 4.9t^2 = 75
    t^2 = 15.31,
    t1 = 3.91s.

    t2 = 3.91 - 1.75 = 2.16s.
    d2 = Vo*t + 4.9t^2 = 75,
    2.16*Vo + 4.9(2.16)^2 = 75,
    2.16Vo + 22.9 = 75,
    2.16*Vo = 75 - 22.9 = 52.1,
    Vo = 24.1m/s. = Initial velocity of 2nd stone

    1. 👍 1
    2. 👎 0
  2. post

    1. 👍 0
    2. 👎 1
  3. Post malone babyyyyy

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. physics

    While standing at the edge of the roof of a building, you throw a stone upward with an initial speed of 6.93 m/s. The stone subsequently falls to the ground, which is 17.1 m below the point where the stone leaves your hand. At

  2. Physics !!

    1) A stone is dropped from the roof of a building; 2.00 s after that, a second stone is thrown straight down with an initial speed of 25 m/s and the two stones land at the same time. i) How long did it take the first stone to

  3. physics

    A spelunker (cave explorer) drops a stone from rest into a hole. The speed of sound is 343 m/s in air, and the sound of the stone striking the bottom is heard 3.24 s after the stone is dropped. How deep is the hole?

  4. physics

    While standing at the edge of the roof of a building, you throw a stone upward with an initial speed of 7.65 m/s. The stone subsequently falls to the ground, which is 11.1 m below the point where the stone leaves your hand. At

  1. physic

    A stone is dropped from the roof of a high building. A second stone is dropped 1.00s laterHow far apart are the stones when the second one has reached a speed of 12.0m/s ?

  2. physics

    A stone is dropped from a 75 m high building. when this stone has dropped 15m, a second stone is thrown downward with an initial velocity such that two stones hit the ground at the same time. find a. time taken for the first stone

  3. PHYSICS

    A stone thrown from the top of a building is given an initial velocity of 40.0 m/s straight upward. The building is 70.0m high, and the stone just misses the edge of the roof on its way down, determine (A) The time at which the

  4. Physics

    A stone is dropped from a tower 100 meters above the ground. The stone falls past ground level and into a well. It hits the water at the bottom of the well 5.00 seconds after being dropped from the tower. Calculate the depth of

  1. physics

    A spelunker drops a stone from rest into a hole. The speed of sound is 343 m/s in air, and the sound of the stone striking the bottom is heard 1.50s after the stone is dropped. How deep is the hole? how can i use the speed of

  2. Physics

    A stone is dropped from an airplane at a height of 490 m. The stone required 10 s to reach the ground at what rate does gravity accelerate the stone?

  3. science

    A stone is dropped into a well of 80m deep. The sound of splash is heard 4.20 sec after the stone is dropped. Find the velocity of sound in air.

  4. Calculus

    To estimate the height of a building, a stone is dropped from the top of the building into a pool of water at ground level. How high is the building if the splash is seen 6.7 seconds after the stone is dropped? Use the position

You can view more similar questions or ask a new question.