Find torque due to gravity at any time t about point of projection. If a body of mass m is projected at an angle `theta` with speed `v_(0)` at t = 0.

Explanation

To find the torque due to gravity at any time \( t \) about the point of projection for a body of mass \( m \) projected at an angle \( \theta \) with an initial speed \( v_0 \), we can follow these steps:

### Step 1: Understand the Setup
- A body of mass \( m \) is projected at an angle \( \theta \) with an initial speed \( v_0 \).
- The gravitational force acting on the body is \( mg \), where \( g \) is the acceleration due to gravity.

### Step 2: Identify the Position of the Body at Time \( t \)
- At time \( t \), the horizontal and vertical components of the velocity can be expressed as:
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