AIPMT PRELIMS 2009 Physics Conservation of Momentum MCQ Question
An explosion blows a rock into three parts. Two parts go off at right angles to each other. These two are, 1 kg first part moving with a velocity of 12 ms⁻¹ and 2 kg second part moving with a velocity of 8 ms⁻¹. If the third part flies off with a velocity of 4 ms⁻¹, its mass would be:
7 kg
17 kg
3 kg
5 kg
Correct Answer
Detailed Explanation
Using conservation of momentum, the total momentum before and after the explosion must be equal. Solving for the third mass using vector addition of the momenta of the first two parts, the mass is found to be 17 kg.
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