A particle falls towards the earth from infinity. The velocity with which it reaches earth's surface (g to acceleration due to gravity on earth's surface and R is the radius of the earth)

A particle falls towards the earth from infinity. The velocity with wh

1.	A particle falls towards the earth from infinity. The velocity with which it reaches earth's surface (g to acceleration due to gravity on earth's surface and R is the radius of the earth)
Answer» `2gR` `SQRT(2gR)` `sqrt(GR)` `R"/"G` Answer :B