The acceleration due to gravity on the Earth's
surface is g. If R is the
radius of the Earth, what
is the acceleration due to
gravity at a height 2R above
the Earth?

explanation:

v=uf/(u-f)

= 5.-10/(5+10) convex lens has negative focal length

the body's situation won't change the forces are equal opposit and on the same body

wavelegth as in spectrum red oygbiv

r = ρ x length / area  

ρ = r x area / length  

ρ is in ohm-meters  

in basic units, it is m³kg/s³a²  

i think this is it.