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JEE Main Physics question

PhysicsSystems of Particles and Rotational MotionJEE Main

If a skater of weight 3 kg has an initial speed 32 m/s and a second one of weight 4 kg has 5 m/s, after collision they have a common speed of 5 m/s. Then the loss in K.E. is [CPMT 1996]

Answer: (D)

Solution

Loss in KE = ½(3)(32)² + ½(4)(5)² − ½(3+4)(5)² = 1536 + 50 − 87.5 = 1498.5

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Question ID VK-154112