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Consider elastic collision of a particle of mass m moving with a velocity u with another particle of the same mass at rest. After the collision the projectile and the struck particle move in directions making angles {{\theta }_{1}}and {{\theta }_{2}}respectively with the initial direction of motion. The sum of the angles. {{\theta }_{1}}+{{\theta }_{2}},is [UPSEAT 2004]A) 45{}^\circ B) 90{}^\circ C) 135{}^\circ D) 180{}^\circ |
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