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QAIPMT-2009-Ph-2183: NEET 2009 Physics - Class 11 AIPMT-2009-Ph-2183 Solution: An explosion blows a rock into three parts. Two parts go off at …
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 and 2 kg second part moving with a velocity . If the third part flies off with a velocity of , its mass would be:
Multiple Choice Options
- A 7 kg
- B 17 kg
- C 3 kg
- D 5 kg
Step-by-Step Verified Solution
When an explosion breaks a rock, by the
law of conservation of momentum, initial
momentum is zero and for the three pieces,
Total momentum of the two pieces 1 kg and 2 kg
= 12 2 + 16 2 = 20 k g m s _ 1
The third piece has the same momentum and in the
direction opposite to the resultant of these two
momentum.
_ Momentum of the third piece = 20 kg ms �1
Velocity = 4 ms �1
_ Mass of the 3 rd piece = m v v = 20 4 = 5 kg