Qualification > Sciences

physics doubt

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nid404:

--- Quote from: sweetie on April 29, 2010, 04:03:45 pm ---but its written in the Que's to treat the whole line as straight!!!

--- End quote ---

treating XY to be straight only for the calculation of the area of the trapezium...not otherwise (if u extend the rest of the line it wouldn't be close to XY)

sweetie:
ok... Thank You
can u help me in Q9 of may04

nid404:
s= v2 sin 2theta / g    tan theta=1.25/10
 10= v2 sin (2X7.125)/ 9.8
  v2= 10/ 0.025=398.125
       v = root of 398.125= 20

T.Q:

--- Quote from: sweetie on April 29, 2010, 04:41:57 pm ---ok... Thank You
can u help me in Q9 of may04

--- End quote ---
ANOTHER WAY

uy=0

so  , s=0.5gt^2

t= (1.25/0.5g)^0.5

t= 0.51 s

v= d/t

v=10/0.51

v= 19.8 ms-1

so the answer is D

sweetie:
thanx sooo much nid and T.Q
+rep

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