When viewing a scene on a dvd in frame-by-frame mode, how can you tell if an object in the frame is moving?

you dont have to explain just answer. greatly appreciated if answer asap.
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Describe the path of a ray that approaches a mirror parallel to the principal axis.

Aball is thrown upward in the air, and its height above the ground after t seconds is h ( t ) = 57 t − 16 t 2 feet. find the time t when the ball will be traveling upward at 14.25 feet per second.

Which of these is not a possible type of energy transformation? a. electrical energy into light energy b. sound energy into nuclear energy c. potential energy into kinetic energy d. kinetic energy into mechanical energy