Answer:
Acceleration due to gravity,

Step-by-step explanation:
It is given that,
Mass of the suitcase, m = 2 kg
Weight on a particular planet, W = 18 N
We need to find the acceleration due to gravity on that planet. Weight of an object is given by :

g is the acceleration due to gravity



So, the acceleration due to gravity on that planet is
. Hence, this is the required solution.