When Do Two Rockets Traveling in the Same Direction Share the Same Velocity?

[1man]

Physics please help with Motion of Two Rockets?

Two toy rockets are traveling in the same direction (taken to be the x axis). A diagram is shown of a time-exposure image where a stroboscope has illuminated the rockets at the uniform time intervals indicated.

http://session.masteringphysics.com/problemAsset/1006902/29/1006902.jpg

1) At what time(s) do the rockets have the same velocity?

at time t = 1 only
at time t = 4 only
at times t = 1 and t = 4
at some instant in time between t = 1 and t = 4
at no time shown in the figure

2) At what time(s) do the two rockets have the same acceleration?

at time t = 1 only
at time t = 4 only
at times t = 1 and t = 4
at some instant in time between t = 1 and t = 4
at no time shown in the figure
3) The motion of the rocket labeled A is an example of motion with uniform (i.e., constant) __________.

and nonzero acceleration
velocity
displacement
time

4) The motion of the rocket labeled B is an example of motion with uniform (i.e., constant) __________.

and nonzero acceleration
velocity
displacement
time

5) At what time(s) is rocket A ahead of rocket B?

before t = 1 only
after t = 4 only
before t = 1 and after t = 4
between t = 1 and t = 4
at no time(s) shown in the figure

 

[collinsmark]

Hello 1man,

What do you think?