When a body falls freely under gravity, then which of the following quantities DOES NOT remain constant: 

The correct answer is Distance.

Key Points

• When a body falls freely under gravity, it is under constant acceleration due to gravity, which is approximately 9.8 m/s² near the Earth's surface.
• The mass of the falling body remains constant as it falls, as mass does not change with motion.
• The universal gravitational constant (G) is a fundamental constant of nature and does not change.
• The distance covered by the body, however, changes continuously as the body falls, increasing with time.

Additional Information

• Acceleration due to Gravity (g)
  • It is the acceleration of an object due to the force of gravity alone.
  • On Earth, the average value of g is approximately 9.8 m/s².
  • It remains constant for objects in free fall near the Earth's surface.
• Universal Gravitational Constant (G)
  • It is denoted by G and is a key quantity in Newton's law of universal gravitation.
  • The value of G is approximately 6.674 × 10⁻¹¹ N(m/kg)².
  • It is a constant and does not change with location or motion.
• Mass
  • Mass is a measure of the amount of matter in an object.
  • It remains constant regardless of an object's state of motion.
  • It is typically measured in kilograms (kg).
• Distance
  • Distance is a measure of how far an object has moved.
  • It changes as the object moves, increasing with time as the object falls.
  • In free fall, the distance covered can be calculated using kinematic equations.
• Kinematic Equations
  • These equations describe the motion of objects under constant acceleration.
  • They include equations for calculating velocity, distance, and time.
  • For free fall, the distance covered by a body can be calculated using $s = ut + \frac{1}{2}gt²$ , where u is the initial velocity (zero for free fall), g is the acceleration due to gravity, and t is time.