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amcavoy
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Here is a link to the image: http://img500.imageshack.us/img500/2681/171812nv.gifA 2.00-kg object with speed of 25.0 m/s strikes a frictionless steel plate at an angle of 30.0o and rebounds at 25.0o. Find the vector change in momentum pf-pi.
I found the initial momentum to be [itex]\left(50\cos{30^o},-50\sin{30^o}\right)[/itex] and the final momentum to be [itex]\left(50\cos{25^o},50\sin{25^o}\right)[/itex]. To find the change, I just subtracted these, but the answer is incorrect. Note: The method I used to find the initial and final vectors was to multiply the magnitude of the velocity by sine and cosine respectively, and then by 2 (the mass).
Can someone give me a hint as to where I went wrong?
Thank you.
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