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Question

Two particles of equal mass have velocities V1=4¯i and V2=4¯j. First particle has an acceleration a1=(5¯i+5¯j)ms−2 while the acceleration of the other particle is zero. The centre of mass of the two particles moves in a path of

A
Straight line
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B
Parabola
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C
Circle
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D
Ellipse
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Solution

The correct option is A Straight line
Xcm=m1x1+m2x2m1+m2
X1=(4t+125t2)
X2=0
Xcm=4t+125t22
Ycm=m1y1+m2y2m1+m2
y1=125t2
y2=4t
Ycm=m(52+2)+m(4t)m+m
Ycm=4t+125t22
Xcm=Ycm
Hence centre of mass moves in a straight line


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