Previous Year NEET Question- Gravitation

• 2017: The correct answer is (B).

The period of revolution of a satellite is given by T = 2π√(r^3/GM) where r is the radius of the orbit and M is the mass of the earth. If the radius of the orbit is increased, then the period of revolution will increase.

• 2018: The correct answer is (C).

The speed of a planet in an elliptical orbit is given by v = √(GM(2/r - 1/a)). The speed of the planet is greater at the perihelion and smaller at the aphelion.

• 2019: The correct answer is (B).

The potential energy of a body is given by U = mgh. The change in potential energy of the body is ΔU = mg(h2 - h1). When the body is taken from the surface of the earth to a height h above the surface of the earth, the change in potential energy of the body is ΔU = mg(h - 0) = mgh.