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 of . If the third part flies off with a velocity of , its mass would be
7 kg
17 kg
3 kg
5 kg
As we learnt in
Inelastic Collision -
Law of conservation of momentum hold good but that of kinetic energy is not
- wherein
Net momentum of the two pieces 1kg and 2kg
momentum of third piece =
mass of 3rd Piece =
Option 1)
7 kg
This solution is incorrect
Option 2)
17 kg
This solution is incorrect
Option 3)
3 kg
This solution is incorrect
Option 4)
5 kg
This solution is correct