Qualification > Sciences
P.H.Y.S.I.C.S P2 D.O.U.B.T.S CIE
scorpion9500:
hey every1 about 2008 6b
i got it
i will just give u the hint and u figure it
if s2 is closed then electricity will pass through it and wont pass through B as there is less resistance in that route
so imagine that there is no B when s2 is closed
zxcvbnm:
hey so i came across a few questions regarding momentum (i dont remember the year) but they mainly dealt with the final momentum not being the same as the initial momentum, and asked for the reason for this...i think it was in november 09, paper 22, the question realted to projectiles...wait i'll try finding it...please help me with this asap!
zxcvbnm:
no,it's not from 09....so basically the question asked about a ball hitting a plate and bouncing, but the final momentum not being the same as the initial momentum....
zxcvbnm:
oh momentum is conserved but i still dont get it
here
Q4, c
Chingoo:
Momentum of the ball before and after collision is not the same, because the momentum of an isolated system remains conversed, not of a particular object. Hence the plate gains the momentum in the direction lost by the ball and so, the momentum of the system (ball and plate) is conserved.
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