Question Detail
Question
A ball drops from 2.5 m and rebounds to 2.3 m. If its mass is 1.0 kg, how much energy is lost?
Correct Answer
Option B is the correct answer.
Detailed Explanation
The energy lost is the difference in potential energy: ΔPE = mg(y₁ - y₂) = (1.0 kg)(9.8 m/s²)(2.5 m - 2.3 m) = 9.8 × 0.2 = 1.96 J.
Hint
Energy lost = initial PE - final PE.