Plastic collosion of two bodies of equal mass results in a common velocity after impact which is

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Sum of their initial velocities

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In lowering a weight of 100 kg along an a inclined plane at an angle of 45? with

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In lifting up a weight of 100 kg at a constant speed of 3 m/sec

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In lowering the weight at a constant speed of 3 m/sec

Q. Plastic collosion of two bodies of equal mass results in a common velocity after impact which is