100 Joules
The question is testing on how to calculate work done;
We are given;
We are required to calculate the amount of work done.
How do we calculate work done?
In this case;
Force = mass × 10 N/kg
= 5 kg × 10 N/kg
= 50 N
Therefore;
work done = 50 N × 2 m
= 100 Joules
Thus, the work done in lifting the object is 100 Joules