Answer:
1400joules
Step-by-step explanation:
work(j)= force × distance.
Distance is from 5m to 12 that is 7m
Force, we weren't given, and the formula is mass × acceleration due to gravity. mass is 20kg and a is 10 or 9.8
f= 20×10
f=200
work= 200 × 7
work= 1400joules
Hope it helped(...and is correct )