Final Answer:
The efficiency of the electric motor is 97.5%.
Explanation:
The efficiency of the electric motor can be calculated using the formula: Efficiency = (Useful energy output / Total energy input) x 100% In this case, the useful energy output is the kinetic energy produced, which is 975J, and the total energy input is the chemical energy, which is 1000J. Therefore, the efficiency of the electric motor is: Efficiency = (975J / 1000J) x 100% = 97.5%
This means that 97.5% of the chemical energy input is transformed into useful kinetic energy, while the remaining 2.5% is wasted as thermal and sound energy.
This high efficiency indicates that the electric motor effectively converts most of the input energy into useful kinetic energy.
In summary, the electric motor transforms 1000J of chemical energy into 975J of kinetic energy, resulting in an efficiency of 97.5%. This demonstrates the effectiveness of the motor in converting energy and minimizing waste.