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Physics CIE help

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tmisterr:
explain Q 9,11, and 15, im getting different answers to what they are giving constantly!!

nid404:
9) D
a=v-u/t
V at M1= at1
V at M2= at2
v2=u2 +2as
v2-u2=2as

(at2)2-(at1)2=2as (s=h)
a=2h/ (t22-t12)

tmisterr:
Thanks, wat bout the other 2?

nid404:
11) sum of momentum before collision=sum of momentum after collision

ball A
mVA- mUA
ball B
mVB-(-mUB)(opp  direction )

p of ball A=ball B (for elastic collision)

mVA- mUA=mVB-(-mUB)
VA-UA=VB+UB
VA-VB=UB+UA

nid404:
15) this one is A

the resultant of the horizontal and vertical components will be equal to the third component in the opp direction
If you notice the rest, they have no such corelation...

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