Displacement of Thrown Ball: Solve in 15min

[Derby4Life]

Pls help me with the solving of this problem below i need to submit it within 15min...
A ball was thrown up to a height of 10m and catches it back.what is the displacement of the ball

 

[Carid]

Displacement = InitialPosition - FinalPosition

 

[Derby4Life]

Please could u solve it and post here?plss