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Math Help - Stuck on part 2 on this derivative question

  1. #1
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    Question Stuck on part 2 on this derivative question

    A bullet is fired such that is follows a part given by x = 315t, y = 65t -4.9t^2
    PART 1
    Find the Magnitude and direction of the velocity with t-2.5 sec.
    Vx = 315 and Vy = 40.5 with R=317.6 and Angle 7.3 degree.

    PART 2
    Now it asks find the time at which the bullet in this question would have a y component of 0, then find the the magnitude and firection of the velocity at that time. t>0

    Answer is 321.6 and angle of -11.66 degree.
    I am stuck on part 2 of this question. HELP, Thanks, Jo
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  2. #2
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    to see when the y component is 0, just set y=0 and solve for t.
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  3. #3
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    Well I was thinking that, but thought it was more, thank you for your reply.
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