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Physics Homework involving projectile motion.

  1. Oct 8, 2011 #1
    1. The problem statement, all variables and given/known data

    A golf ball is hit with a velocity of 50 m/s. The angle to the ground is 17 degrees. find t

    2. Relevant equations
    The equation my teacher provided was: y=vi(sinθt)-4.9t^2


    3. The attempt at a solution

    0= 50sin17-4.9t^2
    0=-4.9t^2-48.1t

    this is where i got stuck... i guess it's more the actual algebra that i'm stuck on. I tried the quadratic formula but i got an odd answer and now i'm blanking on other options. it's only my 3rd week of school so i'm still sort of rusty.

    any help would be greatly appreciated!
     
  2. jcsd
  3. Oct 8, 2011 #2

    gneill

    User Avatar

    Staff: Mentor

    Check that your calculator is set for angles in degrees rather than radians.
     
  4. Oct 8, 2011 #3
    Thank you! New calculator...
     
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