The object started from rest, reached a maximum velocity of $$20 \, \mathrm{m/s}$$ and then returned to rest
The object started from rest and covered a total distance of $$20 \, \mathrm{m}$$ in $$4 \, \mathrm{s}$$
The object's final displacement was $$40 \, \mathrm{m}$$: $$20 \, \mathrm{m}$$ in the first $$2 \, \mathrm{s}$$ and $$20 \, \mathrm{m}$$ in the next $$2 \, \mathrm{s}$$
The object reached a displacement of $$20 \, \mathrm{m}$$ in $$2 \, \mathrm{s}$$ and then came back to the original point, with a final displacement of $$0 \, \mathrm{m}$$