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Homework Help: Kinematic Relationships

  1. Nov 9, 2005 #1
    Question 3
    A toy rocket is fired vertically upwards with an initial velocity of 29.2 ms-1. Calculate how long (in s) the rocket stays in the air before it returns to the ground.
    s=?
    u=29.2
    v=0
    a=-g
    t=?
    i've used t=(v-u)/a and then multiplied the answer by 2
    is this the correct method to calculate the answer.
    thanks in advance
     
  2. jcsd
  3. Nov 9, 2005 #2

    Doc Al

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    Staff: Mentor

    Looks good to me.
     
  4. Nov 9, 2005 #3

    verty

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    Homework Helper

    v is 0 at the apex.

    Edit: Sorry, I see you multiplied by 2.
     
    Last edited: Nov 9, 2005
  5. Nov 9, 2005 #4
    cheers!!!!!!!!!!!!!!!!!!!!
     
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