Answer
(a) 44.8 km
(b) The additional distance is 16.2 km
Work Step by Step
(a) We can find the magnitude of the displacement:
$\sqrt{(39~km)^2+(22~km)^2} = 44.8~km$
(b) The total distance when traveling from Killarney to Mallow and then to Cork is $39~km + 22~km$ which is $61~km$.
We can find the additional distance traveled:
$61~km-44.8~km = 16.2~km$
