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JEE Main Physics question

PhysicsSystems of Particles and Rotational MotionJEE Main

A shell at rest at the origin explodes into three fragments of masses 1 kg, 2 kg and m kg. The 1 kg and 2 kg pieces fly off with speeds 5 ms⁻¹ along the x-axis and 6 ms⁻¹ along the y-axis respectively. If the m kg piece flies off with a speed of 6.5 ms⁻¹, the total mass of the shell must be

Answer: (B)

Solution

Momentum of the 1 kg piece = 5 kg·ms⁻¹ (x); of the 2 kg piece = 12 kg·ms⁻¹ (y). Resultant = √(5²+12²) =

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Question ID VK-153262