A workman pushes a barrel with weight $2000\,\text{N}$ along a plank that is $2.0\,\text{m}$ long and up into a lorry. The rear of the lorry is $0.80\,\text{m}$ above the level road surface. What is the work done on the barrel against gravity?
- A$1000\,\text{J}$
- B$1600\,\text{J}$
- C$2500\,\text{J}$
- D$4000\,\text{J}$