PH-944
Conservation of energy
Physics · Secondary 3 · Hard · Conservation of energy
A 2.0 kg object is dropped from rest from a height of 5.0 m. Ignore air resistance. What is its speed just before hitting the ground? (Take m s⁻².)
- 5.0 m s⁻¹
- 7.1 m s⁻¹
- 10 m s⁻¹
- 20 m s⁻¹
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