Here is a good example I found:
Inside the vehicle the insect has already attained the velocity of the car. It need not do anything to move at that speed. When it need to fly one or two meters to reach the front panel of your car it just need to fly this distance in its normal speed. (In effect the velocity of the insect at that time is the velocity of the car +/- the speed of the insect flying to the front or back of the car).
Suppose you carry an orange in your hand while traveling in a bullet train at 200 miles per hour the orange also gained the same velocity. If you hold the orange in your hand and just drop it down it will fall near your legs. But imagine a person standing outside the train and seeing only the orange as you drop it. He will see an orange that fly in the air at the speed of 200 miles per hour and slowly descending!
If you drop the orange inside the train it will fall down just below where you dropped it. But if you drop the orange outside the train the orange will be moving ahead and will fall on ground meters away from where you dropped it.
https://www.quora.com/Does-an-insect-flying-inside-a-vehicle-need-to-keep-with-the-speed-of-it-or-if-inside-in-the-front-fly-faster-than-the-vehicle
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