Question

A particle falls towards earth from infinity. Its velocity on reaching the earth would be :

• A. infinity
• B. $\sqrt{2gR}$
• C. $2\sqrt{gR}$
• D. zero

Answer 1

Answer: (B)

If a particle falls towards the earth from infinity, then velocity on reaching earth $\upsilon =\sqrt{2gR}$ where $R=$ radius of earth.