A car moves up a slope at a steady speed of $25\,\text{m s}^{-1}$. The engine-driven wheels exert a forward force of $3000\,\text{N}$. A drag force from air resistance and friction acts with a magnitude of $2100\,\text{N}$. The component of the car’s weight down the slope is $900\,\text{N}$. At what rate is thermal energy being dissipated?
- Azero
- B$2.3 \times 10^4\,\text{W}$
- C$5.3 \times 10^4\,\text{W}$
- D$7.5 \times 10^4\,\text{W}$