You watch as a firecracker rises high and explodes in an enormous blossom of light, breaking up into many pieces. Which statement (s) accurately describe the conditions immediately before and after the firecracker explodes: I. The total momentum of the fragments is equal to the original momentum of the firecracker. II. The total kinetic energy of the fragments is equal to the original kinetic energy of the firecracker.

Question

Physics

Ethan Huang

14 July, 05:19

You watch as a firecracker rises high and explodes in an enormous blossom of light, breaking up into many pieces. Which statement (s) accurately describe the conditions immediately before and after the firecracker explodes: I. The total momentum of the fragments is equal to the original momentum of the firecracker. II. The total kinetic energy of the fragments is equal to the original kinetic energy of the firecracker.

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Answers (1)

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Salvador Villanueva · Answer 1

I. The total momentum of the fragments is equal to the original momentum of the firecracker.

Explanation:

When firecracker explodes, force is generated inside cracker which is known as internal force. This force is responsible for fragments flying apart from each other. They fly apart in such a way that total momentum of all the fragments is conserved. Internal force can not change the momentum of the body as a whole. The kinetic energy is not conserved as due to transformation of energy, kinetic energy is increased.