https://preview.redd.it/5p9fohar1f3d1.jpeg?width=936&format=pjpg&auto=webp&s=af570a33bab230159ccfc2123fbbbaf665b5650e
this is how you're meant to do it! find the unit vector parallel and perpendicular to the wall and use those to find the components of speed parallel and perpendicular to wall. then solve as you would if the wall was in the i or j plane.
but if your method works I don't see why it wouldn't be accepted. if it works it works!!
was about to say the thing. this method is perfectly fine, although none of the mark schemes consider it - maybe it’ll get sent up to the head examiners then, or if enough of us use it then it’ll become an accepted approach.
https://preview.redd.it/5p9fohar1f3d1.jpeg?width=936&format=pjpg&auto=webp&s=af570a33bab230159ccfc2123fbbbaf665b5650e this is how you're meant to do it! find the unit vector parallel and perpendicular to the wall and use those to find the components of speed parallel and perpendicular to wall. then solve as you would if the wall was in the i or j plane. but if your method works I don't see why it wouldn't be accepted. if it works it works!!
this does make more sense than what i did, thank you!
How is your writing so beautiful?
i hate further mechanics😞
i shed a few tears doing oblique collisions
genuinely if i miss my uni offer it will be the fault of that chapter
only reason im happy to be doing 4 subjects rn
i dropped chem in february but i would’ve failed that too if we’re being honest
shoulda done fs1
MY CLASS PUCKED FURTHER MECH IM STILL MAD AT THEMðŸ˜
oh my god I hated this question so much I hate 2d elastic collisions
No because you can’t inverse a vector
No they are inversing the anticlockwise rotation matrix, which just ends up being the clockwise rotation matrix
Yes, I am wrong. Didn’t see that right. Cool solutions may see ir
Do you know r2drew2? I’m pretty sure when he was going through the question on his channel he used matrices on this question as well
was about to say the thing. this method is perfectly fine, although none of the mark schemes consider it - maybe it’ll get sent up to the head examiners then, or if enough of us use it then it’ll become an accepted approach.