Fly hitting a train physics problem

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If a train is travelling 100mph in one direction and a fly is travelling 5mph the opposite, and the fly hits the train what speed is the fly travelling at the point of impact?
 

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berkeman
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If a train is travelling 100mph in one direction and a fly is travelling 5mph the opposite, and the fly hits the train what speed is the fly travelling at the point of impact?
5mph. Same speed all the way up until the fly is killed by the impact. Is this a homework question?
 
  • #3
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5mph. Same speed all the way up until the fly is killed by the impact. Is this a homework question?
but surely it changes direction, so at some point it must be travelling at 0mph?

It goes from travelling at 5mph West and then when it hits the train it is travelling 100mph East, so there must be a crossover point when it is neither travelling East or West and is therefore travelling at 0mph?
 

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