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A boy is running to the east and jumps into a stationary boat in a lake. Once the boy lands in the boat, the boat moves to the east. Which best compares the initial momentum of the boy with the final momentum of the boy/boat system?

A
The initial momentum of the boy is zero because the velocity cancels with the mass of the boy.
B
The initial momentum of the boy is greater than the boy/boat because the boy has a greater velocity than the boat.
C
The initial momentum of the boy is less than the boy/boat because the boy has less mass than the boat.
D
The initial momentum of the boy is equal to the boy/boat because the final velocity of the boat is less than the initial velocity of the boy.
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Luke pulls a sled using a force of 65 cap n for a distance of 25 m across level ground. The rope Luke pulls forms an angle of 25 degrees with the ground. About how much work does Luke do on the sled?

A
250 J
B
1 comma 500 J
C
690 J
D
1 comma 600 J
24

What did Johannes Kepler contribute to the study of planets?

A
He identified the first moons of Jupiter.
B
He collected detailed data that led to the proposal of the heliocentric model.
C
He formulated the universal law of gravitation.
D
He provided mathematical support for the heliocentric model.
25

Which best illustrates projectile motion?

A
Image with description A pictorial diagram with a person swimming and position shown in equal time intervals and equally spaced.
B
Image with description A pictorial diagram showing a hot air balloon in four different positions, each the same height from the ground and equally spaced.
C
Image with description A pictorial diagram with a rocket launched straight upward. The first three positions of the rocket are shown with equal spacing between them.
D
Image with description A pictorial diagram of a person hopping sideways at 5 different positions. The start and end positions are on the ground. The third image is the highest off the ground.

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