Correct Answer - Option 1 : Momentum

**Concept:**

**Dyne and Cgs unit**

Dyne is the Cgs unit of Force.

Cgs is the way of expressing the units in C - Centimeter, g - gram, s - second.

**Second Law of Motion:**

The rate of change of momentum is directly proportional to the applied force.

\(F = \frac{Δ P}{t}\)

⇒ Δ P = F.t

Momentum is the product of mass and velocity.

**Explanation:**

So, we have

Δ P = F.t

Or

Momentum = Force × time

So, the unit of momentum is the unit of force multiplied by the unit of time.

Cgs unit of momentum = Cgs unit of force × cgs unit of time = dyne × second

**So, dyne × second is the cgs unit of momentum. **

- SI unit of momentum or impulse is Newton - meter or Kg m /s.
- erg is the Cgs unit of energy.