The escape velocity for a body projected vertically upwards from the surface of earth is $11.2 \ km/s$. If the body is projected at an angle of $45^o$ with the vertical,the escape velocity will be ......... $km/s$.
- A$11.2 / \sqrt{2}$
- B$11.2 \sqrt{2}$
- C$22.4$
- D$11.2$
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