Colliding Balls#

A ball of mass 250 \(g\) with initial velocity 7.24 \(\frac{m}{s}\hat{\imath}\) collides with a ball of mass 129 \(g\) with initial velocity -3.87 \(\frac{m}{s}\hat{\imath}\). The final velocity of the 250 \(g\) ball is -6.41 \(\frac{m}{s}\hat{\imath}\), while the final velocity of the 129 \(g\) ball is 4.81 \(\frac{m}{s}\hat{\imath}\).

Part 1#

Choose the correct statement.

Note: When comparing total momenta and total energies, consider them equal if the final is within 2% (inclusive) of the initial.

Answer Section#

  • This is not possible as momentum is not conserved.

  • This is an inelastic collision because only momentum is conserved.

  • This is an inelastic collision because energy and momentum are conserved.

  • This is not possible because kinetic energy is not conserved.

  • This is an elastic collision, as both kinetic energy and momentum are conserved.

Attribution#

Problem is licensed under the CC-BY-NC-SA 4.0 license.
The Creative Commons 4.0 license requiring attribution-BY, non-commercial-NC, and share-alike-SA license.