Answer:
The difference of their amounts of work is 60 Nm.
Step-by-step explanation:
Given that,
Force exerted by Cindy = 40 N
Distance = 6 m
Force exerted by her brother = 30 N
Distance = 6 m
We need to calculate the work done by Cindy
Using formula of work done

Put the value into the formula


We need to calculate the work done by her brother
Using formula of work done

Put the value into the formula


We need to calculate the difference of their amounts of work
The difference of work done is

Put the value into the formula


Hence, The difference of their amounts of work is 60 Nm.