# Just a breif questionWatch

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#1

Q: http://prntscr.com/jk119u
MS: http://prntscr.com/jk11em

I get what the markscheme did, but here is what i did
My attempt: http://prntscr.com/jk1281

what have i wrongly assumed/done?

Any help would be greatly appreciated thank you!
0
1 year ago
#2
force is (change of momentum)/time
time = distance/ speed
so force is proportional to v^2
1
#3
(Original post by Arctic Kitten)
force is (change of momentum)/time
time = distance/ speed
so force is proportional to v^2
Thank you for your reply! i see what you mean and indeed i do get 2 in the end but what is wrong with the way i have done it? What assumption did i get wrong?
0
1 year ago
#4
(Original post by assassinjeev22)
Thank you for your reply! i see what you mean and indeed i do get 2 in the end but what is wrong with the way i have done it? What assumption did i get wrong?
I'm not sure I understand what you mean, you end up with a sqrt2 right? The only mistake is the force.
0
#5
(Original post by Arctic Kitten)
I'm not sure I understand what you mean, you end up with a sqrt2 right? The only mistake is the force.
yeah i got root 2, for the force i did change in momentum / time, then i did it in terms of velocity but assumed time is constant is this where i went wrong? that i assumed the time between each collision was the same?

Yeah i think this is where i went wrong thank you so much for your help!
0
1 year ago
#6
The time of the collision is not constant, it depends on the speed
0
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