Wave pass an anchored yacht at a rate of five crests every 20 seconds. The crests are separated by a distance of 7m. Calculate 1- The frequency of the waves
2-The speed of the waves

Clike bone scan for find heart

A. to determine if humans can explore mars safely

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.