Question

An object weights 72 N on earth. Its weight at a height of R/2 from earth is

• A. 32 N
• B. 56 N
• C. 72 N
• D. Zero

Answer 1

Answer: (A)

32 N

Answer 2

$g ^ { \prime } = g \left( \frac { R } { R + h } \right) ^ { 2 } = g \left( \frac { R } { R + \frac { R } { 2 } } \right) ^ { 2 } = \frac { 4 } { 9 } g$