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ajmCane22
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Homework Statement
A player bounces a 0.47 kg soccer ball off her head, changing the velocity of the ball from vi= (8.8 m/s)x + (-2.4 m/s)y
to vf= (5.0 m/s)x + (3.0 m/s)y.
If the ball is in contact with the player's head for 6.7 ms, what is the direction of the impulse delivered to the ball?
The Attempt at a Solution
I tried finding the change in velocity which I thought would be (vf-vi)x + (vf-vi)y = (5.0-8.8)x + (3+2.4) = (-3.8 m/s)x + (5.4 m/s)y, so theta would be tan^-1 of 5.4/-3.8 which equals -54.9 degrees. That answer is wrong (I also divided by .0067s which gives the same result, and I also tried 360-54.9=305.1). What am I doing wrong? Please help. Thanks in advance.