Here's why:

* Speed is how fast something is moving. It's a scalar quantity, meaning it only has magnitude (like 250 miles).

* Velocity is speed with a direction. It's a vector quantity (like 250 miles *north*).

Momentum is calculated using the following formula:

Momentum (p) = Mass (m) * Velocity (v)

To calculate the plane's momentum, we need to know its velocity (direction and speed).

Example:

* If the plane is traveling at 250 miles per hour EAST:

* Momentum = 1000 kg * 250 miles/hour EAST = 250,000 kg*miles/hour EAST

Let me know if you have the plane's direction, and I can calculate the momentum!