Two similar spheres, each of mass m and travelling with speed v, are moving towards each other.The spheres have a head-on elastic collision. Which statement is correct?
Correct answer: C. The total kinetic energy after impact is mv2
- A. The spheres stick together on impact
- B. The total kinetic energy before impact is zero
- C. The total kinetic energy after impact is mv2
- D. The total momentum before impact is 2mv
Explanation
Kinetic energy is conversed for elastic collision. As the mass and velocity of the spheres is same their kinetic energy would also be same i.e 1/2 mv2. Therefore, when we add both of their kinetic energies we get mv2.
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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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