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 θ1 and θ2 respectively with the initial direction of motion. The sum of the angles θ1+θ2, is
(a) 45° (b) 90°
(c) 135° (d) 180°
Answer:b
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a