Physics Help Forum projectile question

 Kinematics and Dynamics Kinematics and Dynamics Physics Help Forum

 Oct 26th 2009, 05:35 PM #1 Junior Member   Join Date: Oct 2009 Posts: 1 projectile question im not sure what this question is asking; i think i should make a triangle, but i dont know... "You are in a hot- air balloon that, relative to the ground, has a velocity of 6.6 m/s in a direction due east. You see a hawk moving directly away from the balloon in a direction due north. The speed of the hawk relative to you is 1.8 m/s. What are the magnitude and direction of the hawk's velocity relative to the ground? Express the directional angle relative to due east." I fell like this may be easy, and i'm just dumb, but i dont know.
Oct 26th 2009, 06:32 PM   #2
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Hi and welcome to PHF!
 Originally Posted by jtdawg228 im not sure what this question is asking; i think i should make a triangle, but i dont know... "You are in a hot- air balloon that, relative to the ground, has a velocity of 6.6 m/s in a direction due east. You see a hawk moving directly away from the balloon in a direction due north. The speed of the hawk relative to you is 1.8 m/s. What are the magnitude and direction of the hawk's velocity relative to the ground? Express the directional angle relative to due east." I fell like this may be easy, and i'm just dumb, but i dont know.
Indeed, you can solve the problem by drawing a triangle. I will detail a bit : draw a Cartesian coordinate system in which the extremities of the axis are N, S, W and E. Then draw the velocity vectors in order to answer the question.
Notice however that you have to describe the velocities with respect to the ground, not with respect to you who are in a hot-air balloon.
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