Question: What is the speed a rock needs to be given at the surface of the Earth in order for it to have a residual speed

What is the speed a rock needs to be given at the surface of the Earth in order for it to have a residual speed of 2.5 km/s?

A. 8.7 km/s

B. 10.9 km/s

C. 11.5 km/s

D. 13.7 km/s

20 15 10 10 15 20 Speed at Earth's surface (km/s) Residual speed (km/s)

20 15 10 10 15 20 Speed at Earth's surface (km/s) Residual speed (km/s)

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