JEE Advanced 2008 Physics question
Two balls, having linear momenta and , undergo a collision in free space. There is no external force acting on the balls. Let and be their final momenta. The following option(s) is(are) NOT ALLOWED for any non-zero value of p, , , , , and .
Answer: (A),(D)
Solution
The total initial momentum is zero, so the final momenta must add to zero. (A) The z-components add to : not allowed. (B) with $ =
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