The table shows data for four planetary bodies. If your mass is 68.05 kg, how much gravitational force would you experience on the surface of Mercury?
Newton's law of gravitation is F
gravity
Gmm2. The gravitational constant
G is 6.67 * 10-11 Nm²/C2. (For the purposes of calculating the gravitational
force between a planet and an object on its surface, the distance r is the
radius of the planet.)

good for her? ? where is the question?

its a 5.5 n

glad that

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.