When a body falls from an aeroplane there is increase in its :

Options

A. acceleration
B. potential energy
C. kinetic energy
D. mass

Answer

To solve the question regarding what increases when a body falls from an aeroplane, we can analyze the situation step by step:

### Step 1: Understand the Forces Acting on the Body
When a body falls from an aeroplane, it is primarily influenced by the force of gravity. This force causes the body to accelerate downwards.

**Hint:** Consider the role of gravity and how it affects the motion of falling objects.

### Step 2: Analyze Acceleration
The acceleration of a freely falling body near the Earth's surface is approximately equal to the acceleration due to gravity (g ≈ 9.81 m/s²). This acceleration remains constant as the body falls, assuming air resistance is negligible at the start.

**Hint:** Remember that acceleration due to gravity is constant for objects in free fall near the Earth's surface.

### Step 3: Consider Potential Energy
The potential energy (PE) of the body is given by the formula PE = mgh, where h is the height above the ground. As the body falls, its height (h) decreases, which means the potential energy decreases.

**Hint:** Think about how height affects potential energy and what happens as the height decreases.

### Step 4: Examine Kinetic Energy
The kinetic energy (KE) of the body is given by the formula KE = 1/2 mv². As the body falls, its velocity (v) increases due to the constant acceleration from gravity. Therefore, as the velocity increases, the kinetic energy also increases.

**Hint:** Consider how velocity changes during free fall and how that affects kinetic energy.

### Step 5: Evaluate Mass
The mass of the body remains constant regardless of its motion or position. It does not change as the body falls.

**Hint:** Recall that mass is an intrinsic property of the body and does not depend on its state of motion.

### Conclusion
Based on the analysis:
- The acceleration remains constant (g).
- The potential energy decreases as the height decreases.
- The kinetic energy increases as the velocity increases.
- The mass remains constant.

Thus, the correct answer is that the **kinetic energy** increases when a body falls from an aeroplane.

**Final Answer:** Kinetic Energy increases.