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Question

Consider two perfectly elastic spheres having velocities u1 and u2 in the same direction and masses m and m. When these two spheres collide, the impulse of the blow on the spheres is

A
2mm1m+m1(u1u2)
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B
2mm1mm1(u1u2)
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C
2mm1m+m1(u1+u2)
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D
2mm1mm1(u1+u2)
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