NEET 2013 Physics question
An explosion breaks a rock into three parts in a horizontal plane. Two of them go off at right angles to each other. The first part of mass 1 kg moves with a speed of 12 ms and the second part of mass 2 kg moves with 8 ms speed. If the third part flies off with 4 ms speed, then its mass is -
Answer: (2)
Solution
The rock was at rest, so the total momentum before and after the explosion is zero: . kg m/s and kg m/s, at right angles, so their resultant is $ =
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