Solve Standard Mech Q: Acceleration & Distance in 2 Seconds

[discombobulated]

hi this is a simple question but for some reason it's not clicking.

A ball of mass 0.5kg is pulled across a smooth horizontal floor by a horizontal string attached to the dog. The tension in the string is 0.75N. Calculate the acceleration produced. Given the ball starts from rest, determine how far it will move in 2 seconds.

I know how to do the second part but some help would be appreciated on the first bit please.

F resultant = F - T
F-0.75 = ma
a = F- 0.75 /0.5
errm...and then?

 

[Homer Simpson]

Is the ball rolling? or is it dragging across the floor? Some coeffeciant of friction would be needed if it was being dragged.

 

[discombobulated]

oops sorry i didn't read the question properly, it's actually a bag and it's being pulled across.

 

[Doc Al]

Since the floor is smooth, I would assume that the only horizontal force acting on the bag is the tension in the string, which is given.

 

[discombobulated]

Of course, because then the acceleration = 1.5 which is correct.

Thanks!