Answer:
I would assume 150 MPH, I could be wrong however.
Step-by-step explanation:
Based on the definition of additive affects, "An effect in which two substances or actions used in combination produce a total effect the same as the sum of the individual effects," I would assume that since the wind speed is 100 MPH and the storm is moving at 50 MPH the total wind speed would be 150 MPH. This would make sense because if you think about it, if a storm with 100 mph winds is coming at you at 50 mph, the force of the 50mph winds would hit you when it gets to you along with the 100 mph winds, but again, I am not totally sure.