In an experiment, a marble rolls to the right at speed $$\(v\)$$, as shown in the top diagram. The marble rolls under a canopy, where it is heard to collide with marbles that were not initially moving. Such a collision is known to be elastic. After the collision, two equal-mass marbles are observed leaving the canopy with velocity vec- tors $$\(\vec{v}_{1}\)$$ and $$\(\vec{v}_{2}\)$$ directed as shown. Which of the following statements justifies why the experi- menter believes that a third marble was involved in the collision under the canopy?
A.
Before collision, the only marble momen- tum was directed to the right. After the col- lision, the combined momentum of the two visible marbles is still to the right. Another marble must have a leftward momentum component to conserve momentum.
B.
Before collision, the only marble momentum was directed to the right. After the collision, the combined momentum of the two visible marbles has a downward component; another marble must have an upward momentum component to conserve momentum.
C.
Before collision, the only marble kinetic energy was directed to the right. After the col- lision, the combined kinetic energy of the two visible marbles is still to the right. Another marble must have a leftward kinetic energy component to conserve kinetic energy.
D.
Before collision, the only marble kinetic energy was directed to the right. After the collision, the combined kinetic energy of the two visible marbles has a downward component; another marble must have an upward kinetic energy component to con- serve kinetic energy.
Exam No：AP Physics 1 Problem Set 1 Year：2024 Question No：19
Answer:
B
Knowledge points:
5.4 Conservation of Linear Momentum
Solution:
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