Q. A particle falls towards earth from infinity. It’s velocity on reaching the earth would be
A) Infinity
B) $\sqrt{2gR}$
C) $2\sqrt{gR}$
D) Zero
Explanation
(b) This should be equal to escape velocity $i.e.,\ \sqrt{2gR}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.