$A$ body is projected vertically upwards with a speed of $\sqrt{\frac{G M}{R}}$ ($M$ is the mass and $R$ is the radius of the Earth). The body will attain a maximum height of .......
- A$\frac{R}{2}$
- B$R$
- C$\frac{5}{4} R$
- D$\frac{3 R}{2}$
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