To calculate the efficiency of the ramp, you can use the formula:
\[ \text{Efficiency} = \left(\frac{\text{Useful Work Output}}{\text{Total Energy Input}}\right) \times 100 \]
In this case, the useful work output is 1,200 joules, and the total energy input is 2,000 joules. Plugging in these values:
\[ \text{Efficiency} = \left(\frac{1,200 \text{ J}}{2,000 \text{ J}}\right) \times 100 = 0.6 \times 100 = 60% \]
So, the efficiency of the ramp is 60%.