Indicate the velocity (v) - time (t) graphs for a body:
(i) falling under gravity.
(ii) thrown vertically upwards till it falls back to the ground after reaching the highest point.

Explanation

To solve the question regarding the velocity-time graphs for a body falling under gravity and a body thrown vertically upwards, we will break it down step by step.

### Step 1: Velocity-Time Graph for a Body Falling Under Gravity

1. **Understanding the Motion**: When a body falls freely under gravity, it starts from rest (initial velocity \( u = 0 \)) and accelerates downwards due to gravity. The acceleration due to gravity is denoted as \( g \) and is approximately \( 9.81 \, \text{m/s}^2 \).

2. **Using the Equation of Motion**: The velocity \( v \) of the body at any time \( t \) can be expressed using the equation:
\[
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