If two objects are moving at the same speed, and object 1 has four times as much mass as object 2, how much momentum does object 1 have compared to object 2?

1. twice as much
2. one-fourth as much
3. the same amount
4. four times as much

  concave means having an outline or surface that curves inward like the interior of a circle or sphere. so the mirror curves inward.

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. 

Dshould be the right answer i think