Answer:
The weight of a body is not constant everywhere on the Earth because the gravitational force acting on the body varies with the distance from the center of the Earth. The gravitational force between two objects depends on their masses and the distance between them. Since the Earth is not a perfect sphere and has a non-uniform mass distribution, the gravitational force on an object on the surface of the Earth varies slightly depending on the location.
The weight of a body having mass 50 kg falling on the Earth would be approximately 490 Newtons. This is because weight is the force with which gravity pulls on an object. The weight of an object is equal to the product of its mass and the acceleration due to gravity, which is approximately 9.8 m/s² at the surface of the Earth.
Weight = mass x acceleration due to gravity
Weight = 50 kg x 9.8 m/s²
Weight = 490 N
However, it's important to note that the weight of the body may vary slightly depending on the location on the Earth's surface due to the variation in gravitational force caused by differences in the distance from the center of the Earth.