Qualification > Math

M.e.c.h.a.n.i.c.s

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Ghost Of Highbury:

--- Quote from: chocolatesss on May 16, 2010, 12:10:54 pm ---did u make up this question or is it a prediction.???

--- End quote ---

M1 book, Chapter 2, Ex 2B, Question 15 i suppose.

halosh92:

--- Quote from: cooldude on May 15, 2010, 03:45:58 pm ---let the resistance to the cart=R
therefore X-R=0, X=R
3X-R=ma, 3X-R=800*0.8
2R=640
R=X=320
2X-R=800a
320=800a
a=0.4
v=u+at
5=2+0.4t
t=7.5 sec

--- End quote ---

for the first step u did.........shouslnt we be using F=ma
??(X-R=0).....or is it because its moving at constant speed so we dont use it?

cooldude:

--- Quote from: halosh92 on May 16, 2010, 09:16:27 pm ---for the first step u did.........shouslnt we be using F=ma
??(X-R=0).....or is it because its moving at constant speed so we dont use it?

--- End quote ---

yeah we're using F=ma only but becuase it is moving at a constant speed so a=0 thus ma=0

halosh92:

--- Quote from: cooldude on May 17, 2010, 03:16:24 am ---yeah we're using F=ma only but becuase it is moving at a constant speed so a=0 thus ma=0

--- End quote ---

okek thx  :)

halosh92:
jan 2008 edexcel
Q1a)
for the impulse isnt it
I=mv-mu
I= 4*1-4*5
= -16

how come its negative..in the ms....its +16

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