No wait... That's still not right... The cart was at the point x = 2.8 when t = 0.0 s, but it already had an initial velocity of 1.8 m/s. Now using this information (and that's the last correciton, honest),what was the position of the cart when t = 3.0 s?

Yes

The objects do not reach terminal velocity         there is not enough time from the time the object falls from when it hits the ground to achieve terminal velocity. an object must be placed higher to achieve terminal velocity in order to be in free fall.