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 m 
and the second part of mass 2 kg moves with 8 m 
speed. If the third part flies off with 4 m 
speed, then its mass is
Text Solution
Verified by ExpertsThe correct answer is:
D
: The situation is as shown in the figure.
According to law of conservation of linear momentum
Here, 
The magnitude of 
is
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