A small electric motor is fixed on a workbench, as illustrated. The motor is linked to a $6.0\,\text{V}$ supply and the current through the motor is $0.50\,\text{A}$. The motor has an efficiency of $50\%$. What is the time taken to raise a mass of $200\,\text{g}$ through a height of $90\,\text{cm}$?
- A$0.59\,\text{s}$
- B$0.85\,\text{s}$
- C$1.2\,\text{s}$
- D$2.7\,\text{s}$