In which situation is the smallest amount of energy transferred?
- AA student and a motorcycle of total mass $80\,\text{kg}$ come to rest from a speed of $2.0\,\text{m s}^{-1}$.
- BA student of mass $50\,\text{kg}$ falls a vertical distance of $2.0\,\text{m}$.
- CA student pushes a car with a horizontal force of $70\,\text{N}$ for a horizontal distance of $2.0\,\text{m}$.
- DA student switches on a $70\,\text{W}$ lamp for $20\,\text{s}$.