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Question

A particle of mass m1 moving at a speed v1 allong the positive x direction, collides with another particle of mass m2 at rest. After the collision, the particles have velocities v1 and v2 in the xy-plane in the directions of θ1 and θ2 with the x-axis as shown in the figure. There are no external forces acting on the particles. Express your answer in terms of m1,m2,v1,θ1 and θ2. What is the total momentum of the system before the collision (direction and magnitude)?
828565_a5dff5852de247d38c6071f5674a9065.png

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Solution

Total momentum of system before collision
=m1v1+0
p=m1v1
(p)=m1v1
Hence, the answer is m1v1.

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