A body weights 450 N on the surface of Earth . How much will it weigh on the surface of a planet whose masss is 1/9th mass of Earth and radius is half of radius of Earth?

The weight of the body on the other planet would be 200 N

Explanation:

Recall that the acceleration of gravity at sea level on Earth is obtained via the general Gravitational force formula when the distance "d" is the radius of the Earth (R):

We are told that the weight of the object on Earth is 450 N, that is:

in this other planet the acceleration of gravity will be different as shown below:

so, its gravity is 4/9 that of the Earth, which now we can use to convert its weight (w) on the planet as 4/9 the weight it has on Earth:

snell's law

refractve index = sin incidence / sin refraction