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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 ms–1 and the second part of mass 2 kg moves with 8 ms–1 speed. If the third part files off with 4 ms–1 speed, then its mass is - (1) 3 kg (2) 5 kg (3) 7 kg (4) 17 kg

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 ms–1 and the second part of mass 2 kg moves with 8 ms–1 speed. If the third part files off with 4 ms–1 speed, then its mass is - (1) 3 kg (2) 5 kg (3) 7 kg (4) 17 kg 

Grade:11

2 Answers

grenade
2061 Points
8 years ago
(2)
Using law of conservation of linear momentum
ng29
1698 Points
8 years ago
5kg is the answer
u had to just use law of cons of linear momentum
and solve equations to get the answer
 
 

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