The vertical displacement of a mass of $0.20\,\text{kg}$ varies with time. The graph indicates how this displacement changes. At what rate does it increase gravitational potential energy as it moves upwards?
- A$0.025\,\text{W}$
- B$0.050\,\text{W}$
- C$0.20\,\text{W}$
- D$0.40\,\text{W}$