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An object of mass 0.4kg moving with a velocity of 4m/s collides with another object of mass 0.6kg

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An object of mass 0.4kg moving with a velocity of 4m/s collides with another object of mass 0.6kg moving in same direction with a velocity of 2m/s. If the collision is perfectly inelastic, what is the loss of K.E. due to impact? 

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m1 = 0.4kg,  u1 = 4m/s,  m2 = 0.6kg  u2 = 2m/s.

Total K.E. be fore collision 

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