CBSE Class 11-science Answered
2d motion
Asked by | 25 Jun, 2008, 08:51: AM
Expert Answer
It is given that: I a1 + a2 I =3
Squaring both the sides,and using |a1|=|a2|=1
We get:
2+2cosx=3
or x=60
Now let a1 = i
and a2 =i cos60 + j sin60
(a1 + a2 ) · (2a1 + a2)=(3/2 i + j 3/2).(5/2 i + j 3/2)=15/4+3/4=18/4=4.5
Answered by | 22 Jul, 2008, 11:39: PM
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