AIPMT MAINS2009Physics-Mechanics
AIPMT MAINS 2009 Physics Conservation of Momentum MCQ Question
Type: MCQ-numerical-Hard-Class 11
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:
A
7 kg
B
17 kg
C
3 kg
D
5 kg
Correct Answer
Option B
Detailed Explanation
Using conservation of momentum, the momentum of the third part must equal the vector sum of the momenta of the first two parts. Solving gives the mass of the third part as 5 kg.
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