Aball rolls along the floor with a constant velocity of 6m/s. how far will it have gone after 50s

The equation you want to use is v=d/t (velocity= distance divided by time).  You need to rearrange the equation because you are trying to find distance.  Do this by multiplying both sides of the equation by t and isolating d.  Your new equation is d=vt (d=v x t). 
d=6x50=300m

Heidi’s has to come to a party tomorrow night at the navy house i was like going home i have ig