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Kinematics- Child running down a hill

  1. Sep 23, 2009 #1
    1. The problem statement, all variables and given/known data

    A child runs down a 13 hill and then suddenly jumps upward at a 17 angle above horizontal and lands 1.5 down the hill as measured along the hill. What was the child's initial speed?

    2. Relevant equations

    Unknown. Been trying to use trig to solve distances and as a result velocity.

    3. The attempt at a solution

    distance below starting point: y=1.5sin13=0.337 m
    distance away (x): x=1.5cos13=1.46 m

    as a result used 1.46 to figure out height above starting position with angle 17 degrees.

    1.46tan17=0.446 m

    V^2-Vo^2=2ad
    0-Vo^2=2(-9.8)(.446)
    Vo=2.9566 m/s

    sin17=2.9566/V

    V=10.1 m/s

    THIS IS INCORRECT
     
  2. jcsd
  3. Sep 24, 2009 #2
    Last edited by a moderator: Apr 24, 2017
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