Two small glass spheres of masses 10 g and 20 g are moving in a straight line in the same direction with velocities of 3 ms1 and 2 ms1 respectively. They collide with each other and after collision glass sphere of mass 10 g moves with a velocity of 2.5 ms1. Find the velocity of the second ball after collision.
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this can be found by law of conservation of mass as
m1v1=m2v2
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