Answer
(a) The distance traveled: $15m$
(b) The displacement: $10m$
Work Step by Step
(a) We know that
$Distance\space traveled \space by \space the \space ball=10m+2.5m+2.5m=15.0m$
(b) The required displacement can be determined as
$Required\space displacement=10m+2.5m-2.5m=10m$