Access to cloud computing is an advantage of transmitting information using digital signals. What is "the cloud"?
A. Cables through which lasers send fast pulses of infrared light
B. All of the data downloaded to a user's computer
C. A huge number of servers that communicate over a network
D. The pattern of wave pulses that produces the digital code
The answer is C. A huge number of servers that communicate over a network

You need to be more specific.  i really don't know what a "motion map" is.you can draw a graph of an object's position, distance, displacement, speed,velocity, or acceleration versus time, or you can draw a graph of the object's x-position versus its y-position and not give any information about time at all.if the graph presents position or displacement against time,  then constant velocity is a straight line . . i.e. a line that has  constant slope.if the graph shows speed against time, then constant velocityis a horizontal piece of line.if the graph shows acceleration against time, then constant  velocity is a piece of line that lies on the x-axis . . it's value is zero. 

How are period and frequency related to each other? dperiod is the reciprocal of frequency.