JEE Main Physics question

A body at rest breaks into two pieces of unequal masses [J&K CET 2006]

(A)Both of them have equal speeds
(B)Both of them move in the same line with unequal speedsCorrect
(C)Sum of their momentum is non-zero
(D)They move in different lines with different speeds

Answer: (B)

Solution

By conservation of momentum, the two fragments must have equal and opposite momenta (summing to zero, so (C) is false). Since their masses are unequal, equal momentum magnitudes mean unequal

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Question ID VK-153936