Work Energy and Power - Result Question 58

61. A bomb of mass 30kg at rest explodes into two pieces of masses 18kg and 12kg. The velocity of 18kg mass is 6ms1. The kinetic energy of the other mass is

(a) 324J

(b) 486J

(c) 256J

(d) 524J

[2005]

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Answer:

Correct Answer: 61. (b)

Solution:

  1. (b) From conservation of linear momentum m1v1+m2v2=0

v2=(m1m2)v1=(1812)6=9ms1

K.E. =12m2v22=12×12×92=486J



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