Step-by-step explanation:
Given that,
First force = 10 N
Second force = 30 N
Mass of box = 10 kg
(1). When both forces point due east
Then the net force will be



We need to calculate the acceleration
Using newton's second law

put the value into the formula



The box accelerate towards east.
(2). When 10 N force points due east and 30 N force points due west.
Then the net force will be


We need to calculate the acceleration
Using newton's second law




The box accelerate towards west.
Hence, This is the required solution.