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# M2 work,energy and power question watch

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1. I think kikzen's method is the way to go. I did the same, but neglected (x+10+30).
2. (Original post by pratik)
OK. so now i've got four different answers..
---------------------------
22.9 and 7.22 m from SasunD.
4.13 from Shift3
and by using Kikzen's method I got 10.2 m
---------------------------
I haven't got the Edexcel text book right now, but if somebody has, then coluld he/she check it out for me pls ( or else i can check it when i go back home tonight). i think this question appears in one of those last exercises at the end of each chapter.
ta.
hehe.

nowhere near, apparently.

Question 17 on ex 3C
3. (Original post by kikzen)
hehe.

nowhere near, apparently.

Question 17 on ex 3C
i did it with my method, slightly adjusting it,

i made PE at teh floor.

ok.

PE before = 50xgsin12

PE after = 1500gsin8

loss = 50xgsin12 - 1500gsin8

work done against fric = 20(x+40)
50xgsin12 - 1500gsin8 = 20(x+40)
x(50gsin12 - 20) = 800 + 1500gsin8
x = 34.8m as required
4. well done!
5. welldone !!
phew!

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