A shell explodes into four unequal parts. Which one of the following is conserved?
Correct answer: C. Momentum
- A. Potential energy
- B. Kinetic energy
- C. Momentum
- D. Both potential and kinetic energy
Explanation
In an explosion internal forces redistribute momenta but if no external force acts the total linear momentum of the system is conserved. Kinetic energy need not be conserved.
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Displacement, velocity and acceleration describe motion, including the horizontal and vertical components of projectile motion. The chapter connects these quantities with Newton's laws, momentum and impulse, then applies conservation of momentum to collisions, distinguishing elastic collisions from inelastic ones.
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