Question

a bomb of mass 12 kg explodes in to two pieces of mass 4kg and 8kg mass is 6m/s .find kinetic energy of other mass

Answer 1

Given,

As we know that,

=> Initial Momentum = Final Momentum

=> 12 x 0 = 4(v) + 8(6)

=> 0 = 4v + 48 kg m/s

=> -48 = 4v

=> -48/4 = v

=> -12 m/s = v [ -ve signs indicate that body is moving in opposite direction ].


Since, We found velocity,

=> K.E = 1/2 mv^2

=> K.E = 1/2 x 4 x (-12)^2

=> K.E = (2 x 144) Joules

=> K.E = 288 Joules.




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