Question
A body which is initially at rest at a height R above the surface of the Earth of radius R, falls freely towards the Earth, then its velocity on reaching the surface of the Earth is
BITSAT
Physics
Gravitation
2024
BITSAT 2024 (Memory Based Paper 3)
BITSAT Physics Question (2024) — Solution
Options
- A. (2 g R)
- B. (g R)
- C. 3 2 g R
- D. (4 g R)
Answer
B. (g R)
Step-by-step solution
Increase in kinetic energy = Decrease in potential energy aligned & 1 2 m v^2= m g R 1+ R R = m g R 2 ( U= m g h 1+ h R , h=R ) \\ & m v^2=m g R v= g R aligned
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