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Question

Two sphere A and B of masses m1 and m2 respectively collide. A is at rest initially and B is moving with velocity v along x-axis. After collision B has a velocity v2 in a direction perpendicular to the original direction. The mass A moves after collision in the direction.

A
θ=tan1(12) to the x-axis
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B
θ=tan1(12) to the y-axis
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C
Same as that of B
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D
Opposite to that of B
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Solution

The correct option is A θ=tan1(12) to the x-axis
There is no external force acting on the spheres. So linear momentum will be conserved.
Before the collision, In direction x, Linear momentum =m2v ....1
In direction y, Linear momentum=0
After the collision, spheres moves as shown in figure. Let velocity of sphere A is v1
In direction x, Linear momentum =m1v1cos(θ) ...2
In direction y, Linear momentum =m2v2m1v1sin(θ) .......3
Linear momentum will be conserved,
From equation 1 and 2, m1v1cos(θ)=m2v ...4
From the equation 2, m2v2m1v1sin(θ)=0 m1v1sin(θ)=m2v2 ......5
Dividing equation 5 by 4, tan(θ)=12 θ=tan1(12)

942039_765859_ans_266f0d6d334a42a59190a90ba1174ed3.JPG

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