A rocket is shot a building. When it impacts, it blows apart the front door. The building's mass is 6.5* 10^7. What is the momentum of the building before the impact?

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The formula for calculating momentum is

p = m x v

where p is momentum, m is mass in kg, and v is velocity in m/s

In this case, you are asking for the momentum of the building.

This should provide you with enough information to figure it out.