Which of the following situations best illustrates a use of Conservation of Momentum?

1.
A police officer at the scene of an accident wants to use the vehicles initial motions to determine their final speeds

2.
A student dropping an egg from the roof wants to calculate its final speed,

3.
A soccer player wants to determine the kicking angle that will cause the ball to travel farthest.

4.
A baker wants to calculate how long it will take an oven to reach a certain temperature.