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 
and 2 kg second part moving with a velocity 8 
. If the third part flies off with a velocity of 4 
, its mass would b
Text Solution
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: 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 
kg 
The third piece has the same momentum and, in the direction, opposite to the resultant of these two momenta.
Momentum of the third piece 
kg 
Velocity 
Mass of the 
piece 
kg
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