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JEE Main Physics question

PhysicsSystems of Particles and Rotational MotionJEE Main

An explosion blows a rock into three parts. Two parts go off at right angles to each other. These two are: a 1 kg first part moving with a velocity 12 ms⁻¹, and a 2 kg second part moving with a velocity 8 ms⁻¹. If the third part flies off with a velocity of 4 ms⁻¹, its mass would be

Answer: (A)

Solution

Momentum of the 1 kg part = 12 kg·ms⁻¹; of the 2 kg part = 16 kg·ms⁻¹ (perpendicular). Resultant

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Question ID VK-153265