Answer:
Explanation:
mass of each part = 6 / 3 = 2 kg .
momentum of each of given part = 2 x 20 = 40 kg m/s
Two momentum of 40 kg m/s , acting at angle 60 degree .
Resultant momentum = 2 x 40 cos 30 = 69.28 kg m/s
The third mass will have equal and opposite momentum to this momentum , following law of conservation of momentum .
If its velocity be v .
2 x v = 69.28
v = 34.64 m /s
Third mass will have velocity of 34.64 m /s
Total kinetic energy of all three mass
KE = 1/2 x 2 ( 20² + 20² + 34.64² )
= 400 + 400 + 1199.92
= 1999.93 J .
