Question

A stationary bomb explodes in gravity-free space breaking into a number of small fragments. Which one of the following statements concerning this event is true? A. Kinetic energy is conserved in this process. B. The fragments have equal kinetic energies. C. The sum of the kinetic energies of the fragments must be zero. D. The vector sum of the linear momenta of the fragments must be zero. E. The velocity of any one fragment must be equal to the velocity of any other fragment.

Answer 1

Answer:

D

The vector sum of the linear momenta of the fragments must be zero.

Explanation:

The law of comservation of momentum is obeyed as the initial bomb particle momentum is nil and final particle momentum after exploding is nil

Note:

the Kinetic energy which was initially nil changes on explosion and all the bomb particles must be of the same size and in same direction for velocity to be conserved. And that can't happen in a bomb explosion