Physics 101- Introduction to Mechanics
February 6- 2-D Motion

Relative Motion

In a western movie, a person shoots an arrow backward from a fleeing horse.  If the velocity of the horse relative to the ground is 13m/s west, and the arrowís velocity relative to the horse is 38m/s east, what is the arrowís velocity with respect to the ground?

1. 41m/s east
2. 41m/s west
3. 25m/s east
4. 25m/s west
5. other

In a sci-fi movie, a person shoots a laser forward from an attacking (approaching) spaceship.  If the velocity of the ship relative to the planet is 2 x 108m/s, toward it, and the laserís speed relative to the shuttlecraft is 3 x 108m/s (speed of light), what is the laserís velocity with respect to the planet?

1. 5 x 108m/s toward the star base
2. 5 x 108m/s away from the star base
3. 1 x 108m/s toward the star base
4. 1 x 108m/s away from the star base
5. other

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 Jeff Phillips phillips@lmu.edu Loyola Marymount University Spring 2002