- A A helium gas is at pressure Platon and- . temperature T, = 0 c. If its pressure is dropped to its initial pressure when it's volume keep/ held Constant: the gas a) Calculate the work done by the gas. 6). What is the final temperature of c). What is the work done by the gas if its volume become twice as initial volume and its return to its initial temperature.

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. 

We can infer that star y is closer but other factors must be considered including the heat of the star, the mass, and the brightness of the star. even though star x seems dimmer it may just be less bright or contain less heat.