Speed gained by a body falling from rest at distance R0 to the earth's surface

1. A.
   $\sqrt{2GM\left(\frac{1}{R} - \frac{1}{R_0}\right)}$
2. B.
   $2GM\left(\frac{1}{R} - \frac{1}{R_0}\right)$
3. C.
   $\sqrt{GM\left(\frac{1}{R} - \frac{1}{R_0}\right)}$
4. D.
   $2\sqrt{GM\left(\frac{1}{R} - \frac{1}{R_0}\right)}$

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1. A.
   $2GM\left(\frac{1}{R} - \frac{1}{R_0}\right)$
2. B.
   $\left[2GM\left(\frac{1}{R} - \frac{1}{R_0}\right)\right]^{1/2}$
3. C.
   $GM\left(\frac{1}{R} - \frac{1}{R_0}\right)$
4. D.
   $2GM\left[\frac{1}{R} - \frac{1}{R_0}\right]^{1/2}$

Tap an option to check your answer.