Week 6, clip 2

Timepoint:  04:32.7

1) A spacetime diagram traces the path of an object through time.  We've just seen an example of circular motion in two spatial dimensions drawn in a spacetime diagram.   The link below is an example of a spacetime diagram for an object in one spatial dimension.  Which of the following statements is true?

http://spark-public.s3.amazonaws.com/introastro/images/Spacetime01.png

- The object is not moving.
- The object is moving backward in time.
- The object is moving with a constant velocity.
- The object is moving with a constant, non-zero acceleration.

Answers:
1) The object is moving with a constant velocity.