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Question: Answered & Verified by Expert
An object of mass 100 kg falls from point $A$ to $B$ as shown in figure. The change in its weight, corrected to the nearest integer is ( $R_E$ is the radius of the earth)

PhysicsGravitationNEETNEET 2024 (Re-NEET)
Options:
  • A 49 N
  • B 89 N
  • C 5 N
  • D 10 N
Solution:
2850 Upvotes Verified Answer
The correct answer is: 49 N
$M g^{\prime}=M g \frac{R^2}{(R+h)^2}$
At A $\quad M g^{\prime}=M g \frac{R^2}{(R+2 R)^2}=\frac{M g}{9}$
At $B \quad M g^{\prime}=M g \frac{R}{\left(R+\frac{3 R}{2}\right)^2}=\frac{M g \cdot 4}{25}$
Change in weight $=M g \frac{4}{25}-\frac{M g}{9}=49 \mathrm{~N}$

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