Physics

On a hot summer day in the state of Washington while kayaking, I saw several swimmers jump from a railroad bridge into the Snohomish River below. The swimmers stepped off the bridge, and I estimated that they hit the water 1.5s later. a) How high was the bridge? b) How fast were the swimmers moving when they hit the water? c) What would the swimmer's drop time be if the bridge was twice as high?

  1. 👍 0
  2. 👎 0
  3. 👁 1,717
  1. a. h = Vo*t + 4.9t^2,
    h = 0 + 4.9(1.5)^2 = 11.03m.

    b. Vf = Vo + gt,
    Vf = 0 + 9.8*1.5 = 14.7m/s.

    c. h = Vo*t + 4.9t^2 = 22.06m,
    0 + 4.9t^2 = 22.06,
    t^2 = 4.50,
    t = 2.1s.

    1. 👍 0
    2. 👎 0
  2. no

    1. 👍 0
    2. 👎 1
  3. Why is 9.8 positive? Shouldn't it be negative as acceleration equals -9.8 m/s^2 and wouldn't be positive as gravity does not go up?

    1. 👍 0
    2. 👎 1
  4. B) is -14.7. it's -9.8 m/s^2 instead of 9.8 m/s^2.

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. Physics

    On a hot summer day, a young girl swings on a rope above the local swimming hole. When she lets go of the rope her initial velocity is 2.25m/s at an angle of 35.0 above the horizontal. If she is in flight for 0.616sec, how high

    asked by Sean on March 13, 2008
  2. Language Arts

    "The Sky Is Low, the Clouds Are Mean This is the poem: The sky is low, the clouds are mean, A traveling flake of snow Across a barn or through a rut Debates if it will go. A narrow wind complains all day How some one treated him;

    asked by Callie on January 26, 2015
  3. History

    please someone help what significant effect did the pig war have? it decided the capital city of Washington territory it determined land use laws within Washington territory it settled the final boundary of Washington territory***

    asked by l ll ll lL on April 23, 2019
  4. Physics waves- check answers please

    I am not too sure if my answers are correct. Here are the questions: 1. A student standing near a brick wall claps her hands and hears the echo 0.250 s later. If the speed of sound was 340.0 m/s, how far from the wall was she? For

    asked by Liz on April 21, 2014
  5. math

    Before they graduate from Great Lakes High School, all 12th-grade students fill out a survey about their future college plans. Are you attending an in-state college after high school graduation? Will you begin college during the

    asked by kyle on November 6, 2019
  1. mathhelop

    A hot-dog stand owner makes a profit of $100 when he sells 90 hot dogs a day. He has a loss of $30 when he sells 25 hot dogs a day. Write a linear equation that represents his profit? No idea what I am supposed to do.

    asked by alisha on June 17, 2017
  2. English, science

    1. Today was Mid-Winter Day. 2. Today was Mid-Summer Day. 3. Today was Mid Summer's Day. 4. Today was Mid Summer Day. [Which expressions do we use?]

    asked by rfvv on October 12, 2018
  3. LANGUAGE ARTS

    Please help with question below What sort of day does Emily Dickinson describe in "the Sky Is Low, the Clouds Are Mean"? an uplesantly hot summer day a cold and nasty winter day a beautiful but sad autumn day a day fo fresh spring

    asked by BUBBLES on January 27, 2015
  4. History

    13 The colonists designed a school calendar so that children would attend school nine months a year, leaving the summer months off. Which answer best explains why? A. School buildings were too hot in the summer. B. Children needed

    asked by YRN DJ on January 14, 2016
  5. Math

    The temperature at noon in Los Angeles on a summer day was 88°F. During the day the temperature varied from this by this much as 7.5°F. Write and solve an absolute value inequality to find the range of possible temperatures for

    asked by Madison on January 28, 2017

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