Manipal Entrance Test 2013 Physics Paper

Value of acceleration due to gravity decreases on going below the surface of the earth.
weight (w) of a body is defined as product of mass (m) and acceleration due to gravity (g)
w = mg
The value of g below the surface of earth at a distance h is given by
g′=g(1−

h

R

)
⇒ W′=W(1−

h

R

)
Given, h=

R

2

,W=500N
W′=500(1−

1

2

)
=

500

2

=250N