physics

A stone is thrown horizontally outward from the top of a bridge, the stone is released 19.6meter above the street below.the initial velocity of the stone is 5.0m/s.determine the (a)total time that the stone is in the air
(b)magnitude and direction of the velocity"projectille just before the it strike the street.
(2)A projectile is fired with an initial speed of 113m/s at an angle of 60.0 degree above the horizontal from the top of a cliff 49.0m high.determine(a)the time to reach the maximum height
(b)maximum height above the base of the cliff reached by the projectile
(c) the total time it is in the air
(d)horizontal range of the projectile.plz help

  1. 👍 0
  2. 👎 0
  3. 👁 856
  1. If it is thrown horizontal, the horizontal speed u remains 5 m/s until it stops.
    u = 5
    v = - g t
    h = 19.6 - .5 g t^2
    or
    0 = 19.6 - 4.9 t^2
    t^2 = 19.6/4.9
    t = 2 seconds in air

    u = 5
    v = -9.8 * 2 = -19.6 m/s

    so speed at ground = sqrt (25 +19.6^2 )
    tan angle below horizontal = 19.6/5

    1. 👍 0
    2. 👎 0
  2. u = 11.3 cos 60 forever
    Vi = 11.3 sin 60

    v = 11.3 sin 60 - 9.8 t
    v = 0 at top so
    at top
    t = 11.3 sin 60 /9.8
    and also at top
    h = 49 + Vi t - 4.9 t^2

    now at h = 0
    0 = 49 + Vi t - 4.9 t^2
    solve quadratic for t when h = 0
    then that is time in air
    range = u t

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. 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

  2. physics

    Two stones, A and B, are thrown horizontally from the top of a cliff. Stone A has an initial speed of 15 meters per second and stone B has an initial speed of 30 meters per second. Compared to the time it takes stone A to reach

  3. physics

    A stone is thrown horizontally with an initial speed of 10 m/s from the edge of a cliff. A stop watch measures the stone's trajectory time from the top of the cliff to the bottom to be 4.3 s. What is the height of the cliff?

  4. Physics

    A stone is thrown horizontally from the top of a 25.00 m cliff. The stone lands at a distance of 40.00 m from the edge of the cliff. What is the initial horizontal velocity of the stone?

  1. physics

    Jack drops a stone from rest off of the top of a bridge that is 24.4 m above the ground. After the stone falls 6.6 m, Jill throws a second stone straight down. Both rocks hit the water at the exact same time. What was the initial

  2. physic

    A girl throws a stone from a bridge. Consider the following ways she might throw the stone. The speed of the stone as it leaves her hand is the same in each case. Case A: Thrown straight up. Case B: Thrown straight down. Case C:

  3. Physics

    A woman on a bridge 75.0m high sees a raft floating at a constant speed on the river below. She drops a stone from rest in an attempt to hit the raft. The stone is released when the raft has 7.00m more to travel before passing

  4. physics

    9. A stone is thrown at an angle of 30° above the horizontal from the top edge of a cliff with an initial speed of 19.6 m/s. A stop watch measures the stone's trajectory time from top of cliff to bottom to be 6.7 s. How far out

  1. Physics

    a stone is thrown at an angle of 30 degrees above the horizontal from the top edge of a cliff with an initial speed of 12m/s. a stop watch measures the stone's trajectory time from top of cliff to bottom to be 8s. how far out from

  2. SCIENCE

    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

  3. Physics

    A woman on a bridge 90.0m high sees a raft floating at a constant sped on the river below. She drops a stone from rest in an attempt to hit the raft. The stone is released when the raft has 6.00m more to travel before passing

  4. physical science

    a stone is thrown horizontally at a speed of 5.o m/s from the top of a cliff 78.4 m high. How long does it take the stone to reach the bottom of the cliff?

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