What is the distance of the spaceship from the earth

Gravitational force on spaceship is given by equation

here = masses of two objects

r = distance between their centers

now it is given that gravitation force due to earth is two times the force of gravitation due to moon

given that

d = 384000 km

now from above equation

r = 269875.5 km

so the distance from earth will be 269875.5 km

explanation:

v=uf/(u-f)

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

b.

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