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A group of students wishes to conduct an experiment on the conservation of momentum. They plan to drop various objects from a balcony for the teacher to catch, as she rolls by on her skateboard. Their teacher will only agree to play along if the students can predict how and why the teacher's speed will change (if, at all).

Which of the following arguments correctly predicts AND justifies what will happen to the teacher's speed when she catches one of the falling objects?

A

The teacher's speed will remain unchanged since the falling objects will have vertical velocity, but the teacher will only have horizontal velocity.

B

The teacher's speed will decrease because there is friction.

C

The teacher's speed will increase because momentum must be conserved and the falling object will have momentum.

D

The teacher's speed will decrease because she will have to apply an impulse to the object to catch it.

E

The teacher's speed will decrease because the object will apply an impulse to the teacher as she will have to apply an impulse to accelerate the object forward.

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