H2P-53
Conservation of energy
H2 Physics · JC 1 · Medium · Conservation of energy
A roller-coaster car of mass 500 kg passes point P at height 12 m above the ground with speed 8.0 m s⁻¹. It then moves without friction to point Q at height 5.0 m above the ground. What is its speed at Q? (Take g = 9.81 m s⁻².)
- 14.2 m s⁻¹
- 10.2 m s⁻¹
- 6.2 m s⁻¹
- 18.2 m s⁻¹
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