A motorcycle begins at rest and accelerates uniformly at 7.9\,\dfrac{\text{m}}{\text{s}^2}7. 9
s
2

m

7, point, 9, start fraction, start text, m, end text, divided by, start text, s, end text, squared, end fraction. We want to find the time it takes the motorcycle to reach a speed of 100\,\dfrac{\text{km}}{\text{h}}100
h
km

100, start fraction, start text, k, m, end text, divided by, start text, h, end text, end fraction.

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. 

The answer would be d. hope this : ))

No. rocks can follow various pathways.

Chope i i hope i did