An ice boat is coasting along on a frozen lake. Friction between the ice and the

Question

An ice boat is coasting along on a frozen lake. Friction between the ice and the boat is negligible, and so is air resistance. Nothing is propelling the boat. From a bridge someone jumps straight down and lands in the boat, which continues to coast straight ahead. Select all correct answers.

The speed of the boat increases after the jumper lands in the boat.
The speed of the boat does not change as a result of the jumper landing in the boat.
The horizontal momentum of the boat increases when the jumper lands in it the boat.
The horizontal momentum of the system does NOT change when the jumper lands in the boat.
The speed boat of the boat decreases after the jumper lands in it.
The horizontal momentum of the boat decreases when the jumper lands in the boat.

Explanation / Answer

The speed boat of the boat decreases after the jumper lands in it. The horizontal momentum of the boat decreases when the jumper lands in the boat. The horizontal momentum of the system does NOT change when the jumper lands in the boat.

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