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16 :http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w11_qp_11.pdf
Q8, Q16, Q25 and Q 28... help please
initial Ek = 0.5mv^2
final Ek = 0.5*2m*v^2
= mv^2
difference = mv^2 - 0.5mv^2
= 0.5mv^2
= Ek/2
So it's C
25 :
F = kx
so k = F/x
So the quantities needed are F and x
So it's C