A stationary bomb explodes in space breaking into a number ofsmall fragments. At

Question

A stationary bomb explodes in space breaking into a number ofsmall fragments.

Atthe location of the explosion, the net force due to gravity is zeronewtons.

Which one of the following statements concerning this event istrue?

(a)Kinetic energy is conserved in this process.

(b)The fragments must have equal kinetic energies.

(c)The sum of the kinetic energies of the fragments must bezero.

(d)The vector sum of the linear momenta of the fragments mustbe zero.

(e)The velocity of any one fragment must be equal to the velocityof any other

fragment.

Explanation / Answer

Option ( d ) is correct. The vector sum of the linear momenta of the fragments must bezero Since from law of conservation of momentum , total momentumbefore explosion = total momentum after explosion

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