Originally Posted by

**n33712** Hi

Have a question that i am having trouble getting my head round, wonder if anyone can help?

Q. Choose the two option that are always true about motion of a particle in a straight line.

A. The speed of the particle is the magnitude of it's velocity.

B. A particle that has zero acceleration and zero velocity must be at the origin.

C. A particle with negative position must have a negative velocity.

D. The acceleration of any object always decreases.

E. A particle which remains stationary has zero velocity and zero acceleration.

F. If two particles have different velocities, then at some time in the future they will collide.

I think E is correct and B, C are incorrect but not sure!

Can anyone help!

Thank you

Matt