Projectile motion rock off a cliff

  • Thread starter maddief
  • Start date
  • #1
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Homework Statement


A rock is thrown down off a cliff at 18 m/s at an angle of 17 below the horizontal. If the rock hits a cliff that is 16m away, how far down did the rock fall.


Homework Equations


Vf= Vi + at
change in Y= Vit + .5at^2


The Attempt at a Solution


I tried solving for time and then plugging that back into the equations and I kept getting -3.87. Please help!
 

Answers and Replies

  • #2
CAF123
Gold Member
2,946
88
You can eliminate time by writing an equation for the x displacement of the rock and subbing this into your equation for it's y displacement.
 

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