Frames of Reference-It\'s AlI Relative 4017 ( Any event can be considered from d

Question

Frames of Reference-It's AlI Relative 4017 ( Any event can be considered from different perspectives. In particular, the description of the motion of a given object would depend on the motion of the person describing the motion, the observer. Any such observer, equipped with a coordinate system and a stopwatch, forms a frame of reference. Usually, we assume that a frame of reference is attached to some object. For instance, "the frame of reference of earth" means the observer is at rest relative to earth. In this problem, you will practice viewing motion and calculating its parameters in different frames of reference. The rules of vector addition and subtraction will be useful here. To denote the velocities in different frames of reference, we will use the following notation pQ means "the velocity of object P in the frame of reference (or with respect to, or relative to) object Q." Consider four cars: A, B, C, and D. The cars are moving along a straight stretch of a road; their velocities are shown in the diagranm 12 m/s 0 m/s 20 m/s The first several questions refer to this diagram.

Explanation / Answer

Part D)

No

we cannot determine the distance between A and B

Part H)

VEA = velocity of car E relative to car A = 8 m/s

VE = speed of car E

VA = speed of car A = 12 m/s

VEA = VE - VA

8 = VE - 12

VE = 20 m/s

VED = VE - VD

VED = 20 - (- 20) = 40 m/s

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