Question

If a fly flew in a train going 65mph would the fly be traveling at 65mph if not what speed?

Answer 1

Depends on the area of relativity, to the ground yes it's going 65mph , to the train itself no it is still

Answer 2

It is very interesting step about Relative velocity. Actually, when you'll see the speed of fly in relation to ground, then it's speed would be 65 mph as train is traveling by that speed but if a person in on Train, then fly is at rest for him

Hope this helps!