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mechanics help

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cooldude:

--- Quote from: manuroqs on May 18, 2010, 05:54:05 pm ---thanx :)
but the answer is wrong for the last part,it's 3.456 J in the marking scheme.I think u made a mistake in calculating the distance for ball with mass 0.3g

the height at which A is above the floor is-->
s=t(u+v)/2
s=1.2(0+2.4)/2
s=1.44m
B's final velocity-->
v^2=u^2+2as
v^2=2*2*1.44=2.4 m/s
dist travelled by B after string becomes slack until it comes to rest-->
v^2=u^2+2as
0=2.4^2+(2*-10*s)
s=0.288m
therefore total dist=0.228+1.44=1.728m
gain in gpe--> mgh=0.2*1.728*10=3.456 J
--- End quote ---

zioziozio:
hey guys .. can you please tell me the hardest mechanics paper u've solved before .. ?
because am revising and i need to know how the hard questions come .. Thanks :)
good luck to all !! :)

AL*Eagle:

--- Quote from: manuroqs on May 18, 2010, 05:28:57 pm ---hi! the mechanics ppr is tommorrow..Can anybody help me out with a question.It's from OCT/NOV 05 Q7)iii).How do u do it?

--- End quote ---

edexcel or cambridge??

manuroqs:
cambridge.But COOLDUDE solved it ;D

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