# Colliding Balls#

A ball of mass 139 $$g$$ with initial velocity 7.29 $$\frac{m}{s}\hat{\imath}$$ collides with a ball of mass 207 $$g$$ with initial velocity -3.9 $$\frac{m}{s}\hat{\imath}$$. The final velocity of the 139 $$g$$ ball is -5.84 $$\frac{m}{s}\hat{\imath}$$, while the final velocity of the 207 $$g$$ ball is 4.66 $$\frac{m}{s}\hat{\imath}$$.

## 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.

• 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.