Why is the answer D for the following 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.
My attempt:
C : I think this answer could be correct because all the fragments net force is zero, so basically they have all the potential energy and kinetics is gone.
E : If the velocity is "0" of all fragments then the velocity of fragment A is equal to the velocity of fragment B, C , etc.....right???? because all fragment have the SAME velocity which is 0.
Explain me please, thanks :)
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.
My attempt:
C : I think this answer could be correct because all the fragments net force is zero, so basically they have all the potential energy and kinetics is gone.
E : If the velocity is "0" of all fragments then the velocity of fragment A is equal to the velocity of fragment B, C , etc.....right???? because all fragment have the SAME velocity which is 0.
Explain me please, thanks :)
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